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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7311149 | Jar with adjustable preload A jar provided with an adjustable preload has a housing defining an anvil surface and a mandrel, movable relative to the housing under an applied load, defining a hammer surface to impact the anvil surface. A trigger mechanism for releasing the mandrel to cause the ... | 12/25/2007 |
| 7299872 | Hydraulic-mechanical jar tool A jar mechanism comprises a housing having a fluid chamber therein, a piston encircled by an annular metering sleeve and movably mounted in the fluid chamber for movement between a first position and a second position, and a jar member moveably mounted in the housin... | 11/27/2007 |
| 7293614 | Multiple impact jar assembly and method A hydraulic jarring tool may be suspended in a well from a wireline, tubular string or drill string, and may be activated to release a tool stuck in the well, or to release the drill string. Each of an upper and lower jarring section include a housing, a piston, a p... | 11/13/2007 |
| 7290604 | Downhole tool with pressure balancing A downhole tool is provided that creates balancing forces that allow a tool such as ajar to continue to function when intrusion of gas into the fluid chamber of the jar occurs to cause gas pressure in the jar to exceed hydrostatic pressure. The excess pressure is ba... | 11/06/2007 |
| 7066251 | Hydraulic jar lock An internal, positive engagement lock that locks a tool, such as a hydraulic drilling jar, in the fully open position when the tool is racked back and when tripping in and out of the hole close to the surface. The lock mechanism is spring biased into a locked positi... | 06/27/2006 |
| 6948560 | Jar for use in a downhole toolstring A jar (10), for use in a downhole toolstring comprising: a hollow housing (11); a jar mandrel (13); a latch sub (14); one or more latch keys (16); a cam surface (17); a chamber (23); a compression spring; and an adjus... | 09/27/2005 |
| 6705415 | Directional drilling apparatus In a directional drilling apparatus in which a sensor/transmitter or sonde is located in one section of a drill string and an element of an adjacent section is configured to “steer” the bore drilled in a predetermined lateral direction, a device is provided for ... | 03/16/2004 |
| 6338387 | Downward energized motion jars An apparatus for jarring a portion of drill string lodged within a borehole, by jarring downhole using tension only, including a first member for attaching a first lower end of the apparatus to the upper end of the lodged tool or pipe through a threadable... | 01/15/2002 |
| 5669458 | Rotary jar A rotary jar is described that is part of a drill string and includes a mandrel and an anvil that move longitudinally in opposite directions to deliver a sharp upward or downward blow that is transmitted to a fish, which may be a separate tool or a portio... | 09/23/1997 |
| 5327982 | Drill string jar apparatus In a drill string jar apparatus having an elongated tool body positionable within a drill string, which would also include a latch mandrel movable within a bore of the tool body between a first neutral position and fired up or fired down positions; a subs... | 07/12/1994 |
| 5103903 | Jar A new and improved mechanical jar apparatus for delivering downhole blows in a wellbore in either of opposite directions in response to the controlled application of a longitudinal force. A plurality of mechanically released collets are employed to releas... | 04/14/1992 |
| 5022473 | Adjustable fishing jar A jar tool for inclusion into a well fishing operating string which provides resilient tensional stretch to operate the tool. The tool is adapted to compress an upper release spring to store energy corresponding to tensional force in the operating string ... | 06/11/1991 |
| 4889198 | Drilling jar latch A latch for a telescoping drill string jar is confined in an opening in the jar housing and engages the arbor of the jar to prevent telescoping action for normal drilling. The latch has a number of spring bars, each with a latch lug extending into a latch... | 12/26/1989 |
| 4694917 | Mechanical jarring devices for use in drilling A jarring device for use in drilling comprises first and second members longitudinally relatively movable between a locked position and a released position said device comprising control means including a pair of locking devices each arranged to prevent r... | 09/22/1987 |
| 4688649 | Mechanical drill string jar A mechanical jar used primarily on drill strings, in earth boreholes, to aid in freeing drill strings stuck in a well bore. A telescoping drill string component is constrained in a selected telescoped condition by a biased lock until enough axial stress i... | 08/25/1987 |
| 4665998 | Mechanical well jar A mechanical well jar is disclosed having inner and outer tubular members movable longitudinally relative to each other a limited distance for connecting in a pipe string. Annular shoulders on the members engage to limit the relative longitudinal movement... | 05/19/1987 |
| 4646830 | Mechanical jar A mechanical jar having a variable diameter tension ring which can be reciprocated from a large into a small diameter chamber and vice versa. When a fishing tool is connected to the jar, the jar is run downhole and set down, and a mandrel retracts into a ... | 03/03/1987 |
| 4629009 | Method and apparatus for firing borehole perforating apparatus Method and apparatus for firing perforating apparatus in a borehole. A mechanically operated firing assembly is run into the borehole on the end of a cable and latched onto a perforating apparatus. Tension is pulled on the cable. At a predetermined tensio... | 12/16/1986 |
| 4582148 | Mechano-hydraulic double-acting drilling jar This invention relates to a double-acting drilling jar characterized by a constantly recharged hydraulic system operating in concert with a mechanical brake to actuate the latter and temporarily inhibit extension of the relatively moving parts utilizing a... | 04/15/1986 |
| 4394883 | Well jar A well jar having an elongated body with an axial passageway and threaded connections for assembly into a string of well pipe. The body has a tubular mandrel slideably mounted within a tubular barrel with the annulus therebetween exposed to well fluid. Fl... | 07/26/1983 |
| 4376468 | Drilling jar A drilling jar to be installed in a set of drill collars in a drill string is disclosed. In the illustrated embodiment, first and second tubular members telescope relative to one another. At the upper end of the lower tubular member, a set of protruding l... | 03/15/1983 |
| 4186807 | Optional up-blow, down-blow jar tool An improvement on the tool shown in U.S. Pat. No. 3,853,187, this tool also embodies in a single structure inner and outer telescopically related tubular elements confining a body of operating liquid and comprising a hydraulically retarded up-blow jar, ac... | 02/05/1980 |
| 4142597 | Mechanical detent jars A jar for use in facilitating the removal of stuck objects from wells. The jar has a telescoping assembly held in a collapsed position by a latching means urged into latching position by a resilient means so that the hammer of the jar is spaced from the a... | 03/06/1979 |
| 4130169 | Downhole connector for use with drill string telemetering system A remotely operated connector for electrically and mechanically coupling a wireline to a connector located at the bottom of a drill string. The connector includes a spring-actuated jar that facilitates the release of the connector.... | 12/19/1978 |
| 4109736 | Double acting jar A double acting jar includes inner and outer telescopically arranged tubular parts movable longitudinally, but nonrotatable relative to each other. Cooperating means on the inner and outer telescopically arranged tubular parts deliver an upward jar to a s... | 08/29/1978 |
| 4036312 | Well jar A well jar is characterized by inner and outer telescoped members held from relative displacement by a latching member having an extending portion thereon. Imposition of an axially directed triggering force exceeding a predetermined magnitude is transmitt... | 07/19/1977 |
| 4023630 | Well jar having a time delay section A well jar has telescoping inner and outer elements having a torque transmitting connection therebetween. An intermediate member is rotatably mounted relative to the telescoping elements and is affixed in a longitudinal direction to one of the telescoping... | 05/17/1977 |
| 3963081 | Double acting mechanical jar A double acting mechanical jar includes an outer housing and a mandrel extending longitudinally thereof with means connecting the mandrel and housing for relative longitudinal movement therebetween while inhibiting relative rotation therebetween. First an... | 06/15/1976 |
