RELATED APPLICATIONS

This application is a continuation-in-part of U.S. Patent Application Serial No. 08/169,628, filed December 20, 1993, now pending. This application is also a continuation- in-part of U.S. Patent Application Serial No. 07/999,414, filed December 24, 1992, now pending. Both of these applications are incorporated by reference herein, in their entirety.

Field of the Invention

The present invention relates to an embossed web or sheet exhibiting high bulk and good emboss pattern definition. The invention further relates to a uniform roll of embossed tissue. In still another aspect, the present invention relates to an embossed element having a cross section including crenels and merlons.

Background of the Invention

Tissue produced using conventional wet press technology must usually be embossed subsequent to creping to improve bulk, appearance and softness. It is known in the art to emboss sheets comprising multiple plies of creped tissue to increase the surface area of the sheets thereby enhancing their bulk and moisture holding capacity. Toilet tissue is usually marketed in rolls, containing a specified number of sheets per roll. Tissue embossed in conventional patterns of spot deboss ents, when packaged in roll form, exhibit a tendency to be non-uniform in appearance often due to uneven buildup of the bosses as the sheet is wound onto the roll. This results in a ridging effect detracting from the appearance of the rolls.

Embossing patterns and methods that emboss products in manner selected to avoid nesting of the bosses in rolled,

folded or stacked sheets of paper product are known. For one example of such a pattern and method, see U.S. Patent No. 4,659,608. This prior art pattern, while improving the nesting problem associated with previous prior art patterns, to only four location, was faced with a spiralling effect similar to the visual spinning of a barber shop pole. In addition, this prior art pattern wrinkles and ridges due to stresses placed upon the boss pattern.

The present invention minimizes this buildup and ridging problem while improving the bulk of the tissue product. The pattern which is formed in the tissue of the present invention may be formed either by debossing or embossing. When an emboss pattern is formed, the reverse side of the sheet retains a deboss pattern. The projections which are formed are referred to as bosses. When a deboss pattern is formed, the reverse side of the sheet retains an emboss pattern and the projections are still referred to as bosses. Thus, the methodologies may be interchanged while producing the same product .

SUMMARY OF THE INVENTION The present invention provides an embossed paper product which is significantly higher in bulk than prior art products. When formed into a roll, the embossed paper products of the present invention has superior roll compression and improved roll structure. Furthermore, the embossing process as described in the present invention requires less penetration depth than prior art emboss techniques resulting in improved life for the embossing rolls and machinery used. In addition, the embossed product of the present invention does not suffer from the disadvantages of the prior art products due to substantial nesting of the boss patterns resulting in uneven and poor roll quality.

To achieve the foregoing advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is disclosed:

A sheet of tissue exhibiting puffiness and bulk having a plurality of bosses formed therein comprising; a plurality of stitchlike bosses arrayed to form polygonal cells making up a lattice structure; and a plurality of bosses forming a first signature boss pattern being centrally arrayed within a plurality of cells, said first signature bosses being formed of linear continuous embossments at a height exceeding 3 thousandths of an inch and a height less than 120 thousandths of an inch; a plurality of bosses forming a second signature boss pattern being centrally arrayed within a plurality of cells, said second signature boss pattern being formed of linear crenulated embossments at a height exceeding 3 thousandths of an inch and a height less than 120 thousandths of an inch and defining a plurality of merlons and crenels, wherein said crenels extend to a depth of at least 2 thousandths of an inch.

There is further disclosed:

A roll of tissue exhibiting puffiness and bulk having a plurality of bosses formed therein comprising: an array of stitchlike bosses forming a lattice of polygonal cells; each said polygonal cell being centrally filled with a plurality of bosses forming one of a multiplicity of signature boss patterns comprising at least a first signature boss pattern and a second signature boss pattern, said first signature boss pattern being non-nesting with said second signature emboss pattern, said bosses being arrayed such that one of said first signature bosses nests with another of said first signature bosses at no more than three locations within said roll and one of said second signature boss nests with

another of said second signature bosses at no more than three locations within said roll.

There is still further disclosed:

A nonwoven fibrous web having an emboss element thereon comprising: a nonwoven fibrous web the majority thereof defining a base plane; a crenulated emboss element formed therein and extending upwardly from said base plane, said crenulated emboss element having an upper and a lower portion; said lower portion being continuous between said base plane and a first plane, said first plane defining the upper edge of said lower portion and the lower edge of said upper portion; and said upper portion having crenels and merlons extending between a second plane defining the uppermost edge of said element and said first plane, said crenels and merlons being spaced along the upper edge of said lower portion of said crenulated emboss element .

There is finally disclosed:

A sheet of tissue exhibiting puffiness and bulk having a plurality of bosses formed therein comprising; a plurality of stitchlike bosses arrayed to form polygonal cells making up a lattice structure; and a plurality of bosses forming a first signature boss pattern being centrally disposed within a plurality of cells, said plurality of bosses having a height exceeding 3 thousandths of an inch and a height less than 120 thousandths of an inch; a plurality of bosses forming a second signature boss pattern being centrally disposed within a plurality of cells, said second signature boss pattern being formed of at least two concentrically arranged arrays of embossments at a height exceeding 3 thousandths of an inch and a height less than 120 thousandths of an inch.

Additional advantages of the invention will be set

forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objects and advantages of the invention will be realized and attained by means of the elements and combination particularly pointed out in the appended claims.

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate various aspects of the invention and, together with the description, serve to explain the principles of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a top plan view of one emboss pattern of the present invention.

Figure 2 is a cross-sectional view of the pattern of Figure 1.

Figure 3 is a top plan view of one signature boss of the emboss pattern of Figure 1.

Figure 4 is a cross-sectional view of a signature boss of Figure 3.

Figure 5 is a cross-sectional view of a stitchlike boss.

Figure 6 is a depiction of the boss elements of the signature boss of Figure 3.

Figure 7 is a top plan view of another signature boss of the emboss pattern of Figure 1.

Figure 8 is a cross-sectional view of the signature boss of Figure 7.

Figure 9 is a cross-sectional view of an emboss element used in Phase I of the development of the double heart design.

Figure 10 is a cross-sectional view of an emboss element used in Phase II of the development of the double heart design.

Figure 11 is a cross-sectional view of an emboss element used in Phase III of the development of he double heart design.

Figure 12 is a cross-sectional view of a crenulated emboss element.

Figures 13 is a photograph of the pattern of Figure 1.

Figure 14 is an enlarged photograph of a portion of the pattern of Figure 1.

Figure 15 is the Tulips Everywhere pattern used in the trials of Example 1.

Figure 16 is the Tulips and Roses pattern used in the trials of Example 1.

Figure 17 is the Single Heart pattern used in the trials of Example 1.

Figure 18 is the Tulips and Stitches pattern used in the trials of Example 1.

Figure 19 is the current Northern Bathroom Tissue pattern used in the trials of Example 1.

Figure 20 is a general comparison of GM MMD Friction versus GM Modulus.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is a paper product having improved bulk and superior pattern definition characteristics while minimizing substantial nesting of the emboss patterns resulting in a product having superior roll quality.

The paper product of the present invention is made up of a nonwoven fibrous web, more preferably a tissue, having an emboss pattern formed thereon.

In one embodiment of the present invention, the product may include a first set of bosses which resemble stitches, hereinafter referred to as stitchlike bosses which resemble dot, dashes or the like, and at least one second set of bosses which are referred to as signature bosses. Signature bosses may be made up of any emboss design and are often a

design which is related by consumer perception to the particular manufacturer of the tissue.

The diameter of the stitchlike boss is preferably at least one and one half times the line width of the continuous or crenulated signature bosses. More preferably, the diameter is two or three times the line width.

In another aspect of the present invention, a paper product is embossed with a wavy lattice structure which forms polygonal cells. These polygonal cells may be diamonds, hexagons, octagons, or other readily recognizable shapes. In one preferred embodiment of the present invention, each cell is filled with a signature boss pattern. More preferably, the cells are alternatively filled with at least two different signature emboss patterns.

In another preferred embodiment, one of the signature emboss patterns is made up of concentrically arranged elements. These elements can include like elements for example, a large circle around a smaller circle or differing elements, for example a larger circle around a smaller heart. In a most preferred embodiment of the present invention, at least one of the signature emboss patterns are concentrically arranged hearts as can be seen in Figure 1. In the most preferred embodiment, the other signature emboss element is a flower.

The embossed paper product of the present invention improves over the prior art product in a number of characteristics. The use of concentrically arranged emboss elements in one of the signature emboss patterns adds to the puffiness effects realized in the appearance of the paper product tissue. The puffiness associated with this arrangement is the result not only of appearance but also of an actual raising of the tissue upward between the two concentric elements.

In one embodiment of the present invention, emboss elements are formed having the uppermost portions thereof

- 8 - formed into crenels and merlons, herein after referred to as "crenulated emboss elements" . By analogy, the side of such an emboss element would resemble the top of a castle wall having spaced projections which are merlons and depressions therebetween which are crenels. Crenulated emboss elements have the advantages of adding high bulk to the paper substrate and further providing enhanced definition and pattern retention to the embossed pattern.

Any of the emboss elements either stitch-like or signature may be formed of crenulated emboss elements. In a preferred embodiment, at least one of the signature emboss patterns is formed of crenulated emboss elements. More preferably, the signature boss pattern is two concentrically arranged hearts, one or both of which is crenulated.

The crenels may be placed in a patterned arrangement of they may be randomly spaced both in the longitudinal and cross-sectional directions. In one preferred embodiment, the crenels are uniformly spaced in both the cross-sectional and longitudinal directions. In another preferred embodiment, the crenels are longitudinally spaced along the periphery of the emboss element. In still another preferred embodiment, the crenels are arranged in a pattern of clusters which vary in number. Finally, in another preferred embodiment, the crenels are arranged randomly on the emboss element. It is understood that the skilled artisan can arrange the crenels in any manner which achieves the objectives of bulk, absorbency and feel desired for the particular application.

The crenels preferably have a width between 2 and 40 thousandths of an inch, more preferably between 5 and 25 thousandths of an inch. The merlons preferably have a width of from 2 to 40 thousandths of an inch, more preferably from 5 to 25 thousandths of an inch.

In a preferred embodiment of the present invention, the signature bosses have a height of between 3 thousandths and 120 thousandths of an inch, more preferably between 5 and

100 thousandths of an inch, still more preferably 40 to 80 thousandths and most preferably 50 to 70 thousandths of an inch. The crenels are preferably at a depth of at least 2 thousandths of an inch, more preferably at least 3 thousandths of an inch. In one embodiment of the present invention, the crenels can be of a depth which approaches the depth of the emboss element, i.e., the crenel extends substantially to the base plane or web. The crenels are preferably at a depth of less than 30 thousandths of an inch and most preferably at less than 15 thousandths of an inch. It is understood that the use of merlons which are unequally spaced or which differ in height are embraced within the present invention.

According to the one embodiment of the present invention, when the web or sheets are formed into a roll, the tissue is aligned so that the bosses are internal to the roll and the debossed side of the tissue is exposed. In the present invention, the boss pattern is offset from the machine direction in the cross direction, the machine direction being parallel to the free edge of the web, by more than 0° to less than 180°, preferably more than 10° to less than 170°.

In one embodiment of the present invention, the boss pattern combines stitchlike bosses with a first signature boss made up of linear continuous embossments and a second signature boss pattern made up of crenulated embossments. The overall arrangement of the pattern is selected so that when the sheets are formed into a roll, the signature bosses fully overlap at a maximum of three location in the roll, more preferably at two locations, the outermost of these being at least a predetermined distance, e.g., about an eighth of an inch, inward from the exterior surface of the roll. Moreover, the overall average boss density is substantially uniform in the machine direction of each strip in the roll. The combined effect of this arrangement is

that the rolls possess very good roll structure and very high bulk.

The signature bosses are substantially centrally disposed in the cells formed by the intersecting flowing lines and serve to greatly enhance the bulk of the tissue while also enhancing the distortion of the surface thereof. At least some of the signature bosses are continuous rather than stitchlike and can preferably be elongate. Other of the signature bosses are crenulated and are also substantially centrally disposed in cells formed by the intersecting flowing lines. The signature bosses enhance the puffy or filled appearance of the sheet both by creating the illusion of shading as well as by creating actual shading due to displacement of the sheet apparently caused by puckering of the surrounding regions due to the embossing or debossing of the signature bosses.

During production trials, a single heart design was produced using a single continuous embossment. The continuous embossment heart was replaced with a single crenulated heart, which provided significant improvements in bulk. Finally, the single heart was replaced with a double heart design comprised of one heart concentrically disposed within a second larger heart. This double heart pattern used crenulated emboss elements for both hearts. The double heart pattern achieved a further improvement in bulk and as described above was perceived as puffier by the displacement of the web upward between the two concentric elements.

Figure 1 illustrates a preferred emboss pattern according to the present invention. The pattern includes first signature bosses (tulips) and second signature bosses (double hearts) which are included within a criss-cross pattern of wavy lines which define polygonal cells having a diamond shape. As can be seen from Figure 1, the wavy lines are formed from stitchlike or dot-like bosses. As is also clear from Figure 1, when the emboss pattern is applied to a paper product, the pattern is offset at an angle from the

- 11 - machine direction. This offset prevent substantial nesting of similar signature bosses.

Figure 2 is a cross-sectional view of the pattern as illustrated in Figure 1. The cross section includes one embossment of the flower (two sides) , one stitchlike boss of the lattice-like pattern and both the interior and exterior heart patterns. Accordingly, viewing the cross section from left to right, the first two elements are part of the continuous element which makes up one part of the tulip pattern. The next, rounder element is a stitchlike element which makes up the wavy lattice pattern. Finally, the last two elements are the exterior and interior hearts, respectively. The values given are emboss depths in thousandths of an inch for one preferred embodiment according to the present invention.

Figure 3 illustrates a single diamond element of the lattice structure of the pattern illustrated in Figure 1, containing a double heart. Views 4-4 and 5-5 are set forth in Figures 4 and 5, respectively. In Figure 3, the rectangular coordinates for points 1-6 which define the double heart pattern in a preferred embodiment of the present invention are set forth in Table 1, below:

Table 1

PT # Rectangular Coordinates

1 - .1953, .3532

2 - .1972, .5447

3 - .1972, .8580

4 -.1972,1.0463

5 -0.538, .9252

6 - .9295,1.2993

Figure 4 illustrates a cross-sectional view of the embossments of both hearts in the double heart design. The dotted lines represent partial depth between heart elements, The values given refer to emboss depths for the elements in one preferred embodiment of the present invention. The tightest bottom gap was measured at 0.013".

Figure 5 illustrates a cross-sectional view of a stitchlike embossment which forms the polygonal cell pattern. The diameter of the embossment has been measured from the apex in 0.005 inch increments to the depth of the boss of 0.050 inches. The diameters of the stitchlike embossment are set forth below in Table 2 :

Table 2

Depth Sectioned Dot Diameter

.005 .051

.010 .063

.015 .068

.020 .073

.025 .078

.030 .082

.035 .087

.040 .092

.045 .096

.050 .101

.055 .106

Figure 6 illustrates the double heart emboss pattern of a preferred embodiment of the present invention. The distance between the bottoms of each element were measured at a depth of 15 thousandths of an inch. The distances are given in Table 3 below. The distances are set forth in inches .

Table 3

Point Distance Point Distance

1 .0196 15 0.0203

2 .0196 16 .0196

3 .0192 17 .0224

4 .0192 18 .0129

5 .0188 19 .0160

6 .0183 20 .0135

7 .0217 21 .0145

8 .0222 22 .0193

9 .0228 23 .0223

10 .0229 24 .0226

11 .0226 25 .0216

12 .0226 26 .0204

13 .0220 27 .0189

.0214

•

Figure 7 illustrates a single diamond element of the lattice structure of the pattern illustrated in Figure 1, containing a tulip. View 8-8 is set forth in Figures 8. All measurements set forth on Figure 7 are set forth in inches. In Figure 7, the rectangular coordinates for points 1-9 which define the tulip pattern in this preferred embodiment are set forth in Table 4, below:

Table 4

Point # Rectangular Coordinates

1 - .1709, .4963

2 - .2463, .5976

3 - .2771, .6501

4 -.4982, .8486

5 -.2304, .7340

6 .0467, .7845

7 -.1884, .8766

8 -.3286,1.1910

9 - .2135,1.1849

The dots 1-46 in this Figure correspond to the rectangular coordinates as set forth in Table 5, below:

Table 5

Dot Rectangular Dot Rectangular Dot Rectangular Coordinates Coordinates Coordinates

1 - .0123, .0459 17 -.7093,1.0614 33 .3063,1.2043

2 -.0871, .1125 18 - .6799,1.1581 34 .3745,1.1519

3 - .1553, .1650 19 - .6834,1.2521 35 .4493,1.0852

4 -.2444, .2157 20 -.6633,1.3417 36 .4740, .9935

5 - .3339, .2503 21 - .6032,4.4177 37 .4358, .8979

6 - .4205, .3032 22 - .5430,1.4961 38 .3803, .8149

7 -.4954, .3697 23 - .4875,1.5790 39 .3201, .7365

8 - .5794, .4366 24 -.4493,1.6746 40 .2600, .6606

9 -.6732, .4828 25 .3762,1.6117 41 .2399, .5710

10 -.7604, .5172 26 - .2988,1.5565 42 .2434, .4769

11 -.8378, .5723 27 - .2116,1.5221 43 .2140, .3802

12 -.9109, .6353 28 - .1178, 1.4760 44 .1610, .2949

13 -.9356, .7271 29 - .0338,1.4091 45 .0985, .2165

14 -.8802, .8148 30 .0411,1.3425 46 .0431, .1335

15 - .8248, .8978 31 .1278,1.2896

16 - .7623, .9761 32 .2173,1.2550

Figure 8 illustrates a cross-sectional view of one embossment of the tulip design. The values set forth in Figure 8 are in inches.

Figures 9-11 will be described fully in the Example 3, below.

Figure 12 is a cross sectional view of the crenulated portion of the double heart emboss pattern of Figure 3. The relative depths of the crenulations are set forth as 0.015" and the width of the top of the merlons in this preferred embodiment is either 0.030 or 0.035 inches.

Figure 13 is a photograph of a section of toilet tissue having the preferred pattern as set forth in Figure 1, embossed thereon.

Figure 14 is an enlarged photograph of a section of toilet tissue which shows the preferred pattern of Figure 1. This photograph clearly shows that the concentrically arranged emboss elements cause the tissue to project forward. This adds to the perception of puffiness, quilting and overall softness.

Figure 15 was a comparative pattern used in Example 1, below. In this pattern, tulips were placed into each cell of the lattice.

Figure 16 is a comparative pattern used in Example 1, below. In this pattern, tulips are alternated with roses in the cells of the lattice.

Figure 17 is a comparative pattern used in Example 1, below. In this pattern, tulips and single hearts are alternated within the cells of the lattice.

Figure 18 is a comparative pattern used in Example 1, below. In this pattern, cells containing tulips are alternated with cells containing a pattern of stitches.

Figure 19 is a comparative pattern used in Example 1, below. This pattern places tulips in the cells of the lattice but leaves each alternating cell empty. This is the current commercial pattern for Quilted Northern Bathroom Tissue.

Figure 20 is a graph that sets forth the general relationship between GM Friction and GM Modulus. As can be seen from the graph, a low friction and a low modulus are both preferred, however, a gain in one may be offset by a loss in the other.

The following examples are not to be construed as limiting the invention as described herein.

Examples

Example 1

In assessing the feasibility of a change in the pattern for Quilted Northern Bathroom tissue, six patterns were selected and visual testing was conducted.

The six patterns which were selected are exemplified in Figures 1, and 15-19. Figure 1 is the preferred pattern of the present invention. Figure 19 is the current commercial pattern for Northern Bathroom tissue.

After the patterns were selected, the patterns were laser engraved into hard plastic plates and transferred under pressure to sheets of tissue. The double heart pattern was crenulated, however, depth of emboss and caliper cannot be used for comparison purposes because they differ between laser engraved plastic plates as used in the trial and steel rolls which are used to produce commercial products. The interrelation of these two variables is demonstrated below for steel rolls (See example 3) .

These sheets were then placed before consumers who were instructed not to touch them, and a series of questions ensued.

The results of these tests are set forth in Tables 6 and 7 below.

Table 6

Design Attribute Ratings

% Rated Best/Second Best Total No. of Respondents = 300

Current Double Single Tulips Tulips & Tulips Heart Heart Everywhere Roses & Stitches

Key % % % % % %

Attributes

Attractive 33 42 37 26 25 20

Puffy 26 44 33 25 27 25

Quilted 23 45 34 19 24 31

Thick 26 35 30 25 26 27

Second % % % % % % Attributes

Approp. for 33 36 33 29 27 20 Quilt Northern

Soft 34 34 33 27 25 22

Comfort 34 37 31 28 24 25

Absorbent 29 38 33 27 23 23

Cushiony 27 40 30 21 24 27

Strong 26 42 29 24 24 28

Table 7

Design Attribute Ratings

% Rated Excellent/Very Good Total No. of Respondents = 300

Current Double Single Tulips Tulips & Tulips Heart Heart Everywhere Roses _ Stitches

Key % % % % % % Attributes

Attractive 50 57 57 58 55 40

Puffy 43 62 57 54 54 46

Quilted 44 63 61 53 59 51

Thick 42 54 50 46 48 46

Second % % % % % % Attributes

Approp. for 54 55 53 55 55 42 Quilt Northern

Soft 51 55 53 51 52 42

Comfort 53 51 54 52 50 46

Absorbent 41 57 52 49 51 42

Cushiony 43 59 53 48 51 47

Strong 42 56 48 47 48 45

Based upon initial consumer perception, the double heart pattern was far superior to the other similar designs Upon the success of the Double Heart/Flower pattern of Figure 1, this pattern was selected for pilot plant trials.

In use tests conducted in the homes of consumers, the two patterns did comparably based upon the questions asked. The Double Heart/Flower pattern, however, received significantly better results when comparing voluntary comments. Based upon these results, plant trials were carried out for the double heart design.

Example 2

Plant trials were carried out to produce the Double Heart/Flower design for Northern Bathroom tissue. The physical data for the rolls produced during this trial is set forth in Table 9, below.

Table 9 Tissue Product Characteristics

Product Sheet Emboss Basis Caliper MD CD GM GM Roll Roll Penetra¬ Count Process Weight (mils) Tensile Tensile Friction Modulus Diameter Com¬ tion

(lbs/rm) (gm3") (gm/3") (inches) pression Depth (%) (mis)

GIO 280 current 18.8 71.9 1046 388 0.145 19.4 4.20 18.0 80 CON¬ commer¬ cial TROL pattern

G 37 280 Double 18.7 72.6 1065 417 0.154 19.0 4.20 18.5 47

Heart/

Flower

G 39 250 Double 18.7 75.5 1021 408 0.154 18.9 4.18 21.1 50

Heart/

Flower

G 32 280 Double 18.8 71.4 1138 457 0.156 22.3 4.19 17.0 45

Heart/

Flower

G 34 250 Double 18.8 74.9 1091 428 0.173 18.9 4.18 20.5 50

Heart/

Flower

G 33 280 Double 18.8 76 1055 408 0.173 20.4 4.17 14.8 50

Heart/

Flower

G 35 250 Double 18.4 82.6 999 393 0.169 17.7 4.17 16.8 55

Heart/

Flower

In Table 9, G13 and G35 were phase I of the testing. Figure 9 is a photomicrograph of the shape of the emboss element of Phase I. G34 and G32 were phase II of the testing. Figure 10 is a photomicrograph of the shape of the emboss element of Phase II. G39 and G37 were phase III of the testing. Figure 11 is a photomicrograph of the shape of the emboss element of Phase III.

The basis weight in Table 9 is a relative measure of the amount of fiber used in the production of the roll. Caliper is an indicator of the thickness of the tissue. MD tensile and CD tensile are indicators of the strength or failure of the tissue. GM friction and GM modulus are best if they are low but a rise in one may be offset by a drop in the other. Roll compression is a relative indicator of how firm a roll is perceived to be. Finally, penetration depth is the depth to which the web is embossed without reference to the element size.

As seen from the data, the tissues according to the preferred embodiments of the present invention are far superior to the control . The results achieved at the lower emboss penetration depths using the crenulated embossing technique could not be achieved with the control emboss pattern.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.