Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 8033917 | Drive shaft assembly for a downhole motor A drive shaft assembly for a downhole motor includes a drive shaft formed with convexly spherical bearing surfaces on each end, and end housings with concavely spherical bearing surfaces for mating contact with the spherical bearing surfaces of the drive shaft, ther... | 10/11/2011 |
| 7412368 | Methods and computer-readable media for determining design parameters to prevent tubing buckling in deviated wellbores Methods and computer-readable media are provided for determining design parameters for oil well casing and tubing to prevent buckling in deviated wellbores. Well parameter data including tubing size, tubing weight, well depth, and well geometry is obtained and may b... | 08/12/2008 |
| 7261636 | Drive A drive in an agricultural machinery driveline has a drive housing (1), which forms an interior (18), and is at least partially filled with lubricant. A first shaft (4) is rotatably supported in the drive housing (1) around a longitudinal... | 08/28/2007 |
| 7252283 | Paper-pickup clutch of automatic paper-feeding device A paper-pickup clutch of an automatic paper-feeding device includes a clamping member and a clamping-force adjusting member and can be applied to image processors such as printers, copiers or scanners. The automatic paper-feeding device includes a shaft and a paper-... | 08/07/2007 |
| 7163069 | Telescopable boring rod mechanism The invention relates to a telescopable boring rod mechanism with at least two mutually displaceable Kelly rods, which are equipped with means for transmitting a torque to the adjacent Kelly rod. At least one of the Kelly rods is constructed from at least two rod se... | 01/16/2007 |
| 7104345 | Downhole rotatable-shaft connector assembly and method A connector assembly for connecting with a rotatable shaft is provided. The connector assembly includes a mating sleeve threadably coupleable about the shaft and a center sleeve sized and shaped for deployment between the shaft and the mating sleeve. The center slee... | 09/12/2006 |
| 6949025 | Downhole motor universal joint assembly A downhole motor universal joint assembly includes a female coupler which receives a male end of a drive shaft. The female coupler has a retainer that prevents separation of the male end and the female coupler. The retainer has a rearward extending skirt with flow p... | 09/27/2005 |
| 6945338 | Drilling bit assembly and apparatus A drill bit comprises a shank member (31), a bit body (32) provided with cutters (33) and flexible material (35) between the shank (31) and the bit body (32) allowing relative tilting movement therebetween to reduce adverse ... | 09/20/2005 |
| 6916248 | Flexible coupling Flexible couplings are provided comprising a male member disposed within a female member in a spaced apart configuration, with the space being filled, at least partially, with an elastically deformable material. The male and female members comprise features that pre... | 07/12/2005 |
| 6594881 | Bit torque limiting device A torque limiting device that allows a drill string to rotate relative to the cutting structure of the bit when a predetermined torque is applied between the cutting structure of the drill bit and the drill string. The torque limiting device utilizes a re... | 07/22/2003 |
| 6332841 | Floating cushion sub A cushion sub for absorbing both axial and torsional vibration in a drill string and including an outer casing connectable at one end to a section of a drill string, and an inner piston reciprocally mounted in a cylinder within the casing, the piston havi... | 12/25/2001 |
| 6302797 | Flexible drill pipe In the invention a flexible drill pipe comprising a plurality of short tube sections assembled end to end. Each short tube section having the same number and type of saw tooth shaped gear teeth cut around the circumference of each end of the short tube se... | 10/16/2001 |
| 6203435 | Drilling motor coupler The coupler is a ball and socket arrangement with retaining, sealing and lubricating features, and torque transmitting elements to rotationally connect the ball and socket. The torque transmitting elements include cams secured to the ball and sliding, to ... | 03/20/2001 |
| 6082457 | Method of using a drill string tool A method of operating a drill string tool for use in a wellbore formed in an earth formation is provided. T he method comprises rotating an upper drill string part while a rotation transfer assembly transfers the rotation of a first element to a second el... | 07/04/2000 |
| 5040620 | Methods and apparatus for drilling subterranean wells A method and apparatus is provided for drilling high-angle, directional and horizontal subterranean wells for hydrocarbon extraction. A drillstring component having at least one helical undercut pumping chamber is described, which drillstring component is... | 08/20/1991 |
| 4844180 | Downhole drilling motor A downhole drilling motor is disclosed in which an output shaft is allowed to translate in axial direction relative to the motor housing over a predetermined stroke. Fluid pressure of a drilling fluid pumped to a rotary drill bit driven by the motor may b... | 07/04/1989 |
| 4811800 | Flexible drill string member especially for use in directional drilling The invention relates to an improved drill string member having at least one spiral groove formed in its outside surface and incorporating a combination of engineering considerations and criteria such that the invention member will have an extraordinarily... | 03/14/1989 |
| 4575015 | Fluid coupling device A thread bobbin holder device having improved sealing between shafts, and consequently less bearing wear. The bobbin holder device is constituted by a bobbin holder body with a bobbin fitted on the outer circumference thereof through a bobbin holder membe... | 03/11/1986 |
| 4560012 | Drill collar structure for use in deviated well bore drilling A drill collar is formed by inner and outer tube means having an annular space extending longitudinally therebetween. Rigid filler material in the annular space forms, with the inner and outer tube means, a unitary elongated tubular structure. The rigid f... | 12/24/1985 |
| 4402495 | Drill string shock absorber with pressurized lubricant system A shock absorbing apparatus for use in a drill string for earth boring operations has a pressurized lubrication system. The shock absorber has a tubular body and a mandrel reciprocally mounted in the body for rotation with it. The mandrel and body telesco... | 09/06/1983 |
| 4331006 | Shock absorber assembly A shock absorber assembly for absorbing shocks encountered by a drill string having a working fluid flowing therethrough wherein the shock absorber assembly includes a housing affixed to the drill string, a mandrel mounted for reciprocal longitudinal move... | 05/25/1982 |
| 4306428 | Torque drive mechanism A new torque drive mechanism is disclosed between a reversible rotatable square bar means for rotating a washer while providing free longitudinal movement of the square rod in the washer, and for providing free passage of liquid therebetween the bar and t... | 12/22/1981 |
| 4303138 | Earth drilling lubricated hydraulic shock absorber and method Earth drilling hydraulic shock absorber having an anvil reciprocally mounted in a casing and operatively connected with a plurality of independently operating pistons, the anvil being reciprocally mounted within the casing through a spline connection with... | 12/01/1981 |
| 4261427 | Long stroke jar bumper sub with safety sleeve A hydraulic jar apparatus to be disposed in a drilling string embodying inner and outer telescopically arranged elements. Overlapping portions of the elements provide an annual chamber confining an operating liquid by an annular seal fixed to the outer el... | 04/14/1981 |
| 4133516 | Shock absorber for well drilling pipe A shock absorber assembly has an outer body connectible at one end in a well drill string and an inner body connectible at one end in the well drilling string, with the bodies telescopically coengaged. Between the bodies is an annular space, filled with h... | 01/09/1979 |
| 4118954 | Motion compensator Disclosed is a motion compensator to permit relative movement between an underwater well installation and a vessel on the water surface. The motion compensator includes telescoping elements, seals between the telescoping elements and ports to permit lubri... | 10/10/1978 |
| 4106779 | Automatic sequential dual action sealing system A shock absorbing subassembly with a body, a mandrel slidably and non-rotatively received in the body, dampening means therebetween, an upper seal above the dampening means and a floating seal therebelow for maintaining an oil bath between the body and th... | 08/15/1978 |
| 4055338 | Drill string shock absorbing apparatus Apparatus is disclosed for use in a drill string during rotary well drilling, especially of shallow holes such as blast holes, to absorb the shock loads imposed upon the drill bit and drill. A floating solid piston in an outer tubular body separates a gas... | 10/25/1977 |
| 4054040 | Telescoping torque transmission apparatus A telescoping torque transmission apparatus including an inner mandrel of upper and lower sections, a sleeve surrounding the mandrel and slidable thereon, a splined drive connection between the sleeve and mandrel with drive keys interposed between all dri... | 10/18/1977 |
| 4043150 | Safety sleeve A safety sleeve shields the working members of a well tool wherein two shoulders come together to eliminate the possibility of workmen loosing a finger between the two shoulders.... | 08/23/1977 |
| 3998443 | Multidirectional shock absorbing device A housing with a mandrel therein is adapted to be connected in a rotary drill string. The housing and mandrel are constructed and arranged to support the work load of the rotary drill string as well as dissipate both longitudinal and radial impact or shoc... | 12/21/1976 |
| 3957125 | Multi-stage double-acting extendible and contractible shaft drive for drilling device A uniquely integrated arrangement of concentric tubes in combination with concentric pistons and special interconnecting fluid pressure passages therein, said component members cooperating in a manner as to permit extreme compound extension or retraction,... | 05/18/1976 |
