| Patent Number |
Title Of Patent |
Date Issued |
| 5070900 |
Safety valve actuator assembly |
December 10, 1991 |
| An emergency shut-down system to close a gate valve in a pipeline and therefore terminate flow. The closing action is initiated when a pilot valve senses pressure in the pipeline outside predetermined limits. This reduces the signal pressure in the system which, in turn, causes a fluid |
| 4961560 |
Two way latching trip valve |
October 9, 1990 |
| A latching trip valve for opening and closing a safety device. The trip valve is operable manually and from the pressure of a pilot circuit which monitors the operating conditions of a pipeline. A floating seat is movable under the influence of a longitudinal movable poppet and its i |
| 4759738 |
Floating cushion sub |
July 26, 1988 |
| A floating cushion connection member is operable between a power head and a drill string member. A first cap member is mounted about the periphery of a piston. A washpipe extends from within the bore of the piston to a mounting area in a second cap member. A body member connects the firs |
| 4703812 |
Mobile drilling apparatus |
November 3, 1987 |
| A mobile drilling apparatus having a support structure, a mast positioned on the support structure, a drill head and a hydraulic assembly vertically operable on and guided by the mast. The hydraulic assembly moves the drill head and includes lower hydraulic cylinders rigidly connected to |
| 4658917 |
Enclosed jar tool |
April 21, 1987 |
| A jar tool having a mandrel and a housing substantially surrounding said housing. The mandrel and housing are splined such that they may move longitudinally relative to each other. First and second pairs of abutment faces for the jar and bump strokes respectively, are provided between th |
| 4593914 |
Wellhead sealing system |
June 10, 1986 |
| A wellhead sealing system comprises a casing, a tubing spool and a bushing between the casing and tubing spool. A first recess is provided in the bushing and a first casing seal is mounted therein to act between the bushing and the casing. A second recess is provided in the tubing spool |
| 4494778 |
Casing hanger |
January 22, 1985 |
| A casing hanger for hanging well casing and sealing the well pressure from the atmosphere. The casing hanger comprises a cooperating slip and slip bowl adapted to grip and retain the well casing when they abut a cooperating shoulder on the casing head whereupon the casing hanger will |
| 4478284 |
Jar tool |
October 23, 1984 |
| A jar tool for use in a drill string for use in dislodging a drill bit or well-tools trapped in well bores. The tool comprises an outer housing adapted to move longitudinally with respect to an inner spline mandrell. A piston assembly is acted on by a piston actuator and hydraulic fluid |
| 4391152 |
Sampler |
July 5, 1983 |
| A sampling device for sampling fluids such as those carried in an oil pipeline comprises two valve means and a sampling chamber located on the fluid passageway in the sampler housing. Fluid is admitted to the probe of the sampling device when the first valve means allows the passageway t |
| 4285494 |
Engine air cut-off device |
August 25, 1981 |
| The present invention provides an engine air cut-off device which can be connected into the manifold air passage of an internal combustion engine. The device includes a valve body having a passage therethrough which is alignable with the manifold air passage, the valve body incorporating |
| 4215845 |
Engine air cut-off device |
August 5, 1980 |
| The present invention provides an engine air cut-off device which can be connected into the manifold air passage of an internal combustion engine. The device includes a valve body having a passage therethrough which is alignable with the manifold air passage, the valve body incorporating |
| 4192155 |
Floating cushion sub |
March 11, 1980 |
| A floating cushion sub for connection to the rotary power head of a drill rig has a mandrel section connectable to a drill string and an outer housing section connectable to the power head. The mandrel and the housing have mating, axially extending splines permitting relative axial movem |
| 3982594 |
Eccentric stabilizer |
September 28, 1976 |
| A stabilizer for use in a blast hole drilling has a shaft connectable at each end to a drill string. A plurality of individual bushings are axially spaced along the shaft, and each bushing carries a roller reamer rotatable thereon. Each bushing has its inner bore eccentrically positioned |
| 3951470 |
Drill steel idler guide |
April 20, 1976 |
| A drill steel idler guide having an internal sleeve rotatably supported in a base by means of ball bearings fitting in opposed annular grooves in the sleeve and base, said sleeve having a bore through which a drill steel can slidably fit. Means is provided for directing pressure air thro |
| 3947044 |
Secondary sealing device |
March 30, 1976 |
| A secondary sealing device is provided for a pump used for pumping gases under pressure. Leakage of gas between a main seal and the pump shaft is permitted up to a predetermined maximum pressure but once that pressure has been exceeded, a pressure sensor activates a switch to stop rotati |
