Patents for Class 175/249 :: Core-retaining or severing means

Matches 101 - 150 out of 202	< 1 2 3 4 5 >

Document	Document Title
2220554	Device for recovering cores from boreholes
2216962	Pressure coring device
2204844	Drilling and coring apparatus
2182035	Detachable blade core bit
2181394	Earth drill bit head
2173677	Core barrel
2148373	Retractable core barrel
2141840	Core taking tool
2141800	Core drill construction
2140097	Rock sampling method
2108949	Valve head structure for core barrels
2079941	Core catcher retainer and seat for a core barrel
2076063	Core barrel
2069797	Core drill
2058119	Formation testing and core taking device
2055648	Core taking device for wells
2046798	Method and apparatus for core drilling
2046106	Core drilling apparatus
2044057	Trap ring for core barrels
2040889	Core drill
2034257	Core barrel
2032423	Core barrel
2020599	Drilling apparatus
2019978	Retractable core barrel
2013838	Roller core drilling bit
2001764	Core drill and valve therefor
1898937	Drilling apparatus
1896703	Core drill
1896469	Telescoping core-drill
1895526	Earth drilling bit
1895001	Core drill
1870696	Self cooling, drilling, and coring bit
1870592	Core drill
1867720	Vent for core drills
1867024	Core drill bit
1864113	Apparatus and method of taking core samples of rock in bore holes
1859950	Core catcher
1857693	Core barrel having core receptacle
1845230	Core-drilling apparatus
1844076	Vent for core barrels
1839417	Turbine operated valve
1837469	Core drill construction
1830681	Core catcher
1815391	Core drill with auxiliary reamer
1813375	Core drill
1804819	Side wall drilling organization
1797550	Core catcher
1793894	Formation direction indicator
1790769	No Title Available
1790542	No Title Available

Matches 101 - 150 out of 202	< 1 2 3 4 5 >