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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 |
| 7775284 | Apparatus for adjustably controlling the inflow of production fluids from a subterranean well A flow control apparatus (800) includes a tubular member (818) having a plurality of openings (820, 822, 824, 826) that allow fluid flow between an exterior and an interior flow path (828) of the tubular member (818) and a multi-st... | 08/17/2010 |
| 7322417 | Technique and apparatus for completing multiple zones An apparatus that is usable with a well includes a string and a plurality of tools that are mounted in the string. The string includes a passageway. The tools are mounted in the string and are adapted to be placed in a state to catch objects (free-falling objects an... | 01/29/2008 |
| 7201232 | Washpipeless isolation strings and methods for isolation with object holding service tool An isolation string having an upper packer and an isolation pipe in mechanical communication with the upper packer, the isolation pipe comprises an operable valve and an object activated valve. An object holding service tool is adapted to release an object to activa... | 04/10/2007 |
| 7124824 | Washpipeless isolation strings and methods for isolation An isolation string having: an upper packer; and an isolation pipe in mechanical communication with the upper packer, wherein the isolation pipe comprises a pressure activated valve and an object activated valve. A method having: running-in an isolation string on a ... | 10/24/2006 |
| 7032666 | Gravel pack crossover tool with check valve in the evacuation port A gravel packing method and apparatus so that when setting the packer, a ball is dropped to a seat that is isolated from the effects of formation pressures when trying to set the packer. This is accomplished by isolation of the gravel pack outlet port when setting t... | 04/25/2006 |
| 6148923 | Auto-cycling plunger and method for auto-cycling plunger lift An auto-cycling plunger and method for lifting out condensate and fluid that accumulate and retard production in oil and gas wells. The auto-cycling plunger comprises a tube that defines an inner chamber, one or more flapper sealing rings mounted on the t... | 11/21/2000 |
| 5915478 | Hydrostatic standing valve An improved standing valve which regulates the amount of accumulated fluid in the tubing string of an oil and gas well, to an amount that is within the purging capability of the gas-lift method. The present invention provides a hydrostatic standing valve ... | 06/29/1999 |
| 5127482 | Expandable milling head for gas well drilling A tool head is separably attached to the end of a hollow well drilling string for cutting operations within a well and for detachment of the cutting head from the string without removing the string from the well. The head is attached by a ball clutch stru... | 07/07/1992 |
| 5044444 | Method and apparatus for chemical treatment of subterranean well bores An apparatus for effecting chemical treatment of any selected portion of a subterranean well bore comprises a pair of vertically spaced, inflatable packing elements which are run into the well on a fluid conduit, such as continuous tubing. The apparatus p... | 09/03/1991 |
| 5020600 | Method and apparatus for chemical treatment of subterranean well bores An apparatus for effecting chemical treatment of any selected portion of a subterranean well bore comprises a pair of vertically spaced, inflatable packing elements which are run into the well on a fluid conduit, such as continuous tubing. The apparatus p... | 06/04/1991 |
| 4887676 | Device for closing a core barrel installed in a drilling rig The invention relates to a device for closing, without a surge, one end of a core barrel installed in a mining or oil drilling rig, optionally equipped with a turbine. This device comprises a tubular element in whose bore there is guided a sliding member ... | 12/19/1989 |
| 4877095 | Stopper for cable passages or conduits Stopper, for cable passages or conduits, having a first chamber placed in said passage, said chamber comprising at least one bearing surface placed in this passage and adapted to cooperate with a closure element, a second chamber opening into the first ch... | 10/31/1989 |
| 4266605 | Wireline safety check valve A check valve for wireline operations is employed in oil well drilling where a high pressure is encountered in a well. The check valve permits a wireline to extend through the check valve and a ball chamber therein. The ball chamber has a check ball there... | 05/12/1981 |
| 4258801 | Dump valve for use with downhole motor A dump valve having a valve seat and a valve member is located in a string of drill pipe above a downhole motor. The dump valve connects the inside of the drill string with the annulus and allows drilling mud to flow freely therebetween when drilling mud ... | 03/31/1981 |
| 4108203 | Check valve assembly A check valve assembly for use in a drill string to prevent reverse flow of drilling fluid through the string while permitting such fluid to be pumped downwardly through the well under normal conditions. The assembly includes: a valve body; a ball valve m... | 08/22/1978 |
