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Class Information
Number: 175/297
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Fluid-operated > Restricted orifice for initially delaying escape of restraining fluid
Description: Apparatus in which said relieving means comprises a restricted orifice through which said fluid may escape when placed under pressure to allow unrestrained movement of said hammer or impact device after a predetermined amount of said fluid has escaped.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
5495902 Coil tubing hydraulic jar device Mar. 5, 1996
5411107 Coil tubing hydraulic jar device May. 2, 1995
5318139 Reduced waiting time hydraulic drilling jar Jun. 7, 1994
5232060 Double-acting accelerator for use with hydraulic drilling jars Aug. 3, 1993
5228516 Tester valve Jul. 20, 1993
5215148 Subsurface well pressure actuated and fired apparatus Jun. 1, 1993
5190114 Flow pulsing apparatus for drill string Mar. 2, 1993
5174393 Hydraulic jar Dec. 29, 1992
5123493 Valve used in a hydraulic drilling jar Jun. 23, 1992
5086853 Large bore hydraulic drilling jar Feb. 11, 1992
5056608 Boring ram Oct. 15, 1991
5052485 Jar mechanism Oct. 1, 1991
5033557 Hydraulic drilling jar Jul. 23, 1991
5009272 Flow pulsing method and apparatus for drill string Apr. 23, 1991
5007479 Hydraulic up-down well jar and method of operating same Apr. 16, 1991
4964477 Pneumatic percussive device Oct. 23, 1990
4865125 Hydraulic jar mechanism Sep. 12, 1989
4846273 Jar mechanism accelerator Jul. 11, 1989
4658917 Enclosed jar tool Apr. 21, 1987
4582148 Mechano-hydraulic double-acting drilling jar Apr. 15, 1986
4566546 Single acting hydraulic fishing jar Jan. 28, 1986
4550789 Hydraulic jarring tool Nov. 5, 1985
4545444 Jar mechanism energizer Oct. 8, 1985
4524838 Oil well jar Jun. 25, 1985
4511007 Locking device for a tool with telescopically displaceable parts Apr. 16, 1985
4478284 Jar tool Oct. 23, 1984
4456081 Hydraulic drilling jar Jun. 26, 1984
4434863 Drill string splined resilient tubular telescopic joint for balanced load drilling of deep holes Mar. 6, 1984
4361195 Double acting hydraulic mechanism Nov. 30, 1982
4346920 Threaded connection using variable lead threads Aug. 31, 1982
4346770 Hydraulic jarring tool Aug. 31, 1982
4284153 Hydraulic drill string jar Aug. 18, 1981
4261427 Long stroke jar bumper sub with safety sleeve Apr. 14, 1981
4230197 Bumping and jarring tool Oct. 28, 1980
4226289 Independent one-way acting hydraulic jar sections for a rotary drill string Oct. 7, 1980
4211293 Variable orifice sleeve valve hydraulic jar tool Jul. 8, 1980
4210214 Temperature compensating hydraulic jarring tool Jul. 1, 1980
4200158 Fluid retarded accelerating jar with negative and positive pressure chambers Apr. 29, 1980
4196782 Temperature compensated sleeve valve hydraulic jar tool Apr. 8, 1980
4181186 Sleeve valve hydraulic jar tool Jan. 1, 1980
4179002 Variable hydraulic resistor jarring tool Dec. 18, 1979
4161224 Fluid dump mechanism Jul. 17, 1979
4111271 Hydraulic jarring device Sep. 5, 1978
4109736 Double acting jar Aug. 29, 1978
4098338 Jarring method and apparatus for well bore drilling Jul. 4, 1978
4081043 Hydraulic jars for bore hole drilling Mar. 28, 1978
4076086 Fishing jar for accommodation of excess tensile load Feb. 28, 1978
4059167 Hydraulic fishing jar having tandem piston arrangement Nov. 22, 1977
4023630 Well jar having a time delay section May. 17, 1977
4007798 Hydraulic jar Feb. 15, 1977

1 2 3










 
 
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