DESCRIPTION OF THE PRIOR ART Oxygen generation devices are known in the art, however, they are either large, cumbersome, and difficult to use, necessitating that they be used in a medical office or hospital. Alternatively means of a size that can be used by a patient, such as high pressure oxygen cylinders are expensive, difficult to transport, and present an explosive or fire hazard.

SUMMARY OF THE INVENTION The present invention is a oxygen generating device which comprises: a container having a mouth and a neck surrounding the mouth; a tank which has an annual flange for establishing a gas tight seal between the tank and the neck; a dome assembly which is engageable with the neck and extends upwardly to define a chamber above the neck (dome chamber); and means for permitting oxygen generated in the tank to flow into the dome chamber by bubbling through a liquid contained in the dome base; the dome base having an outlet connection through which oxygen can leave the tank and enter the dome and where at least part of the dome is transparent so as to render the inside thereof visible from the outside of the dome.

An object ofthe present invention is to provide a device usable by an individual or patient which generates a sufficient supply of oxygen for a wide range of applications. Another object of the present invention is to provide a chemical reaction oxygen generating device which may be refilled by the patient and is reusable or may be a one way, one time delivery system.

Other objects and advantages of the present invention will become apparent from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a front elevation view in a cross-section of the inventive oxygen generation device.

Fig. 2 is a side elevation view of the generation device of Figure 1.

Fig. 3 is a top plan view of the generation device of Figure 1.

Fig. 4 is a perspective view of the oxygen generation device for the present invention.

Fig. 5 is a cross-sectional view of the dome portion of the generation device of Figure 1.

Fig. 6 is a cross-sectional elevation of the dome base and the tank portion of the generation device of Figure 1.

Fig. 7 is a top-sectional view of the dome base of the generation device of Figure 1.

Fig. 8 is a cross-sectional side view of the tank portion of the generation device of Figure 1.

Fig. 9 is a frontal cross-section view of the tank sleeve of the device of Figure 1.

DETAILED DESCRIPTION OF THE EMBODIMENTS Referring to Figure 1, reference number 18 depicts an oxygen generating device which has an upper portion, dome assembly 13, and a lower portion, tank assembly 23, wherein tank assembly 23 comprises a cylinder having a neck 15, to which the dome assembly, dome, and dome base 13 is attachable.

Number 14 is the edge of the nipple fitting 21 located at the top of dome assembly 13.

The nipple fitting advantageously is a recessed assembly. Item 11 is the water level inside dome assembly 13. Lower portion 23 contains a tank 17 where the reaction occurs to produce oxygen.

In addition to the oxygen producing chemical (s), water is advantageously added to tank 17. Item 19 is the inlet for oxygen developed in tank 17. Oxygen is forced by pressure developed by its generation in tank 17 into inlet 19. Tubing 12 receives oxygen from tank 17 through fittings at inlet 19, and delivers oxygen through bubble fitting 20 into water present in the lower portion of dome assembly 13. Optionally a bubble restrictor plate can be fitted to the dome base to adjust or restrict the flow of oxygen or oxygen bubbles.

Item 16 indicates an insulating area, which may be a vacuum or advantageously may be a foam insulation layer between the receptacle and the receptacle sleeve. The oxygen generating reaction takes place inside the receptacle, with the sleeve forming an outside surrounding container for the receptacle.

Referring to Figure 2, number 42 is a side view of tubing 12, number 43 refers to the intake valve and bubble fitting; and 44 is a fitting for the gasket at the intersection of dome assembly 13 and tank 17. Item 45 is a fitting for the gasket at the dome base, number 46 is a fitting for the tank sleeve for attachment to the tank, number 47 is the insulation area, which is advantageously filled with foam between the tank sleeve and the tank, and 40 is an optional means for keeping the tank from spinning in the tank sleeve.

Referring to Figure 3, number 51 is the recessed area forming the outside of nipple 21 in the upper portion of dome assembly 13. Number 52 is the orifice of nipple 21, and number 50 is the edge of recessed area 51 which meets the surface of the dome at the outer edge of nipple 21.

Referring to Figure 4, number 21 is the nipple at the top of dome assembly 13. Number 66 is the dome, number 62 is the dome base, number 63 is the top portion of the tank where it meets the dome assembly, 64 is the area where the tank meets the top of the tank sleeve, and 65 is the tank sleeve.

Referring to Figure 5, number 70 is the edge of the recessed area in dome assembly 13 which forms nipple 21. Number 71 is the orifice on top of nipple 21 in the dome, and number 72 is the tube fitting for nipple 21.

Referring to Figure 6, number 82 is the intake from the tank to dome assembly 13, number 83 represents the threads where the dome assembly attaches to the tank assembly, and number 84 is the shoulder which is set back to provide for a smooth contour and good fit so that the dome assembly overlaps the gasket to prevent it from being squeezed out. Number 85 represents the inside threads that connect to the tank assembly. Number 80 is the bubble valve assembly on the dome base and number 81 is a shoulder joint in the bubble valve assembly.

Referring to Figure 7, number 90 is the bubble valve through which oxygen enters the water in the dome assembly, and number 91 is the intake orifice from the tank to the dome assembly. Advantageously 90 and 91 are equidistant from the center line of the dome, which distances are represented by 92 and 93.

Referring to Figure 8, number 100 represents the threads in the gasket assembly inside of the tank assembly. Number 101 represents the area where the wall of the tank assembly is built up to accommodate the dome fitting over the edge of the gasket and allows for space between the tank sleeve and the tank in order to provide for the insulation area, and number 102 and 103 depict an optional fitting assembly on the base of the tank to prevent the tank sleeve from spinning in the tank Referring to Figure 9, number 110 is the bottom rounded corner on the tank sleeve, number 111 is an optional fitting at the base of the tank sleeve which will prevent it from spinning in the tank, and number 112 is a fitting to facilitate the assembly process; i. e. to accomplish the tank holding itself in place while being moved through the manufacturing process.

Dome assembly 13 is advantageously manufactured from a clear or transparent material, preferably a polymer or plastic, and most preferably polycarbonate. Lower portion tank assembly 23 of the generating device advantageously may be made of opaque, clear or transparent material, preferably a polymer or plastic, and most preferably polypropylene.

In use, water is poured into the dome assembly and then into the tank to a point just below its intersection point with the tank assembly. The water level in the dome assembly is indicated by reference numeral 15. In addition, substance (s) which will react to produce oxygen are poured into tank 17. Advantageously such substances in powder or granule form. Dome assembly 13 is then screwed into tank assembly 23 and tightened, forming a gas tight seal.

Gaseous oxygen increases the pressure in tank 17 when generated by reaction of the substance (s) in tank 17 and is thereby forced upwardly through inlet 19, through tube 12, through fitting 20 and into the water in the dome base. The water that is in the dome base will humidify the oxygen before the oxygen exits dome 13 through nipple 21.

Dome 13 advantageously of a transparent material, therefore the production of oxygen and resultant bubbling will be visible from the outside of the dome. This will be evidence to the user that the device is working properly. Tank assembly 23 may be of an opaque material or transparent material. The arrangement of inlet 19, tube 12, outlet 20 and the diameter of dome 13, which advantageously approaches or is equal to the diameter of receptacle 17, prevents water or the oxygen producing chemicals from finding their way into nipple 21.

In addition, the present inventive device will generate oxygen at a sufficiently high pressure so that it can also be used with a nebulizer. In a nebulizer oxygen under pressure is passed through a liquid medication into a duct provided with a mouthpiece at one end. The present device allows a patient to breath through the mouthpiece and inhale the nebulizer medication. In the use of a conventional nebulizer, a pump is required where the nebulizing gas is air or, alternatively, a high pressure oxygen cylinder where the gas is oxygen. A high pressure oxygen cylinder is an expensive item of equipment, is difficult to transport, and presents an explosive or fire hazard. Such a cylinder cannot in most circumstances conveniently be kept by a patient at home or transported in remote areas. The oxygen generating device of the present invention can, however, in an inexpensive and effective manner, provide oxygen at a sufficiently high pressure to be used with a nebulizer. It is of light weight construction and can conveniently be kept by a patient at home, transported in remote areas and in emergency situations where there is no electricity available, which is not possible with prior art devices.