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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 |
| 8186685 | Seal An annular sealing element to seal between metal surfaces for use in flanges, joints, packers and the like, located in oil and gas exploration and production equipment. The sealing element has inner and outer metal deformable surfaces joined at ends, defining an int... | 05/29/2012 |
| 7363970 | Expandable packer An integral bodied composite packer is constructed entirely of a composite material. It can include an expandable middle portion with an elastomeric cover to engage an exterior surface of a well bore. The expandable portion can include continuous strands of polymeri... | 04/29/2008 |
| 7320367 | Annular isolators for expandable tubulars in wellbores The present disclosure addressed apparatus and methods for forming an annular isolator in a borehole after installation of production tubing. Annular seal means are carried in or on production tubing as it is run into a borehole. In conjunction with expansion of the... | 01/22/2008 |
| 7240904 | Secondary sealing element A secondary sealing element comprises a base body (12) made of a synthetic material and comprising a base portion (13) and a seal portion (14) which each comprise coaxially aligned, axially adjacent through bores (17, 31) for the passage ... | 07/10/2007 |
| 7210533 | Disposable downhole tool with segmented compression element and method A disposable downhole tool includes an elongated body and a compression element. The compression element is disposed about the elongated body. The compression element includes at least one preconfigured division at disposal of the disposable downhole tool. ... | 05/01/2007 |
| 7128145 | High expansion sealing device with leak path closures A high expansion packer or bridge plug is described. It features an external portion of a soft material that flows into spiral exterior leak paths formed when the sealing element is subjected to longitudinal compression. Preferably, the sealing element is an elastom... | 10/31/2006 |
| 7073796 | Metal packing A metallic packing is used to seal a connection between steam pipes. The metallic packing has an annular basement. This annular basement has an opening that joins the holes of the steam pipes. Two annular lips project from an inner circumference of the annular basem... | 07/11/2006 |
| 7017670 | Apparatus and method for expanding and fixing a tubular member within another tubular member, a liner or a borehole An apparatus for securing a tubular member within a liner or borehole has a seal means connected within the tubular member, and a pressure control device operable to increase the pressure within the tubular member, such that operation of the pressure control means c... | 03/28/2006 |
| 6959759 | Expandable packer with anchoring feature An expandable packer or anchor is disclosed. It features a gripping device integral to or mounted in a sleeve over the mandrel and mating undulating surfaces to help maintain grip under changing load conditions. Upon expansion, pressure on a sealing element is enhan... | 11/01/2005 |
| 6905123 | Seals A gas seal for providing a seal between a pair of relatively rotatable components is provided with a stand-still seal which will seal between the components when the components are stationary, the stand-still seal having a sealing element mounted in sealing relation... | 06/14/2005 |
| 6834725 | Reinforced swelling elastomer seal element on expandable tubular An apparatus and method used for sealing a wellbore. The apparatus includes a swelling elastomer disposed around an outer surface of the tubular body. The swelling elastomer is isolated from wellbore fluid in an annulus. However, upon the application of an outwardly... | 12/28/2004 |
| 6779602 | Seal A sealing device is provided for making a seal against an annular surface. The device includes at least one flexible seal ring having a relaxed position in which the seal ring is out of contact with the surface and an active position in which the seal ring is in sea... | 08/24/2004 |
| 6637750 | Alternative metallic seals A metallic sealing element comprises a generally tubular body having first and second opposed ends and a center section which is located between the first and second ends. In use the sealing element is compressible to bring the first and second ends towar... | 10/28/2003 |
| 6409176 | Wellhead housing seal assembly with backup feature A tubular connection, an example of which is a subsea wellhead having a primary and secondary seal areas allows the use of a backup or contingency gasket for engagement with the secondary seal area in the wellhead should a failure occur in the primary sea... | 06/25/2002 |
| 6260850 | Annular chamber seal Internal and external metal-to-metal radially interfering seals are provided for an annular chamber. Typically, an annular chamber is used in tubular goods to be part of the hydraulic control circuitry, such as for operating subsurface equipment such as a... | 07/17/2001 |
| 6250638 | Taper joint well sealing packer and method A downhole packer in a well removably seals an annular space between an inner tube and an outer tube or well casing in a well bore. The packer provides a metal to metal tapered seal between a female sealing element having a tapered inner sealing surface a... | 06/26/2001 |
| 6182755 | Bellow seal and anchor An annular seal is made of a collapsible bellows. The bellows can function as an anchor or a seal and is easily set into position using relative component movement. The bellows folds can be slanted and their outer sealing edges can have different profiles... | 02/06/2001 |
| 6142227 | Expandable retrievable bridge plug A bridge plug (1) for use in a casing (7), for example in oil and/or gas wells, comprising a packing element (2) of a resilient material is disclosed. The packing element (2) is adapted for at impact from a running tool to expand from a first diameter, to... | 11/07/2000 |
| 5702109 | Expandable high-pressure flexible-tube device An expandable high-pressure flexible tube device for sealing piping in gas or oil fields. The device comprises two end pieces interconnected by a tubular element having an elastomeric material and sheets of coils round about its longitudinal axis at a sma... | 12/30/1997 |
| 5700013 | Secondary seal with mechanical gas seal A secondary seal for use in a high temperature and pressure environment, including only non-elastomeric elements, such as an annular wound spring essentially enclosed on three sides by a polymer cladding. Two lips surround the spring, while permitting an ... | 12/23/1997 |
| 5199497 | Shape-memory actuator for use in subterranean wells The present invention is a wellbore tool which includes as a component an actuator which is composed at least in-part of a shape-memory material characterized by having a property of switching between a deformed shape and a pre-deformed shape upon receipt... | 04/06/1993 |
| 4749035 | Tubing packer An improved tubing packer including a sleeve connected in the tubing string and having an outer diameter close to the inner diameter of the string into which it is to seal and a plurality of external grooves having pressure compensating material therein, ... | 06/07/1988 |
| 4709758 | High temperature packer for well conduits A packer for effecting steam treatment of a production formation of a subterranean well comprises an insulated mandrel which is slidably inserted within the bore of an inner tubular body assembly. An outer operative tubular assembly surrounds the inner as... | 12/01/1987 |
| 4665978 | High temperature packer for well conduits A packer for effecting steam treatment of a production formation of a subterranean well comprises an insulated mandrel which is slidably inserted within the bore of an inner tubular body assembly. An outer operative tubular assembly surrounds the inner as... | 05/19/1987 |
| 4554973 | Apparatus for sealing a well casing A method and apparatus for sealing a well casing, when a length of production tubing is disposed within the well casing, utilizes a sealing means having a first diameter less than the diameter of the production tubing, and the sealing means is compressibl... | 11/26/1985 |
| 4548265 | Downhole steam packing A steam or thermal packer for use in subterranean wells having an integral expansion joint is disclosed. The packer has a multi-component, nonresilient, nonenergizing packing element, as well as a multi-component, nonenergizing, nonresilient sealing eleme... | 10/22/1985 |
| 4326588 | Well tool having knitted wire mesh seal means and method of use thereof A well tool, such as a packer apparatus, is adaptable for insertion on a conduit within a subterranean well having casing therein. The well tool comprises a cylindrical mandrel which is communicable to the conduit. Slip means are carried exteriorly around... | 04/27/1982 |
| 4258926 | High temperature well packer A well packer has a mandrel assembly with a tubular packing element supported thereon between upper and lower support members that are arranged to telescopically compress the packing element upon setting of the packer. The packer is constructed to retain ... | 03/31/1981 |
