Patents by Inventor Don B. Wafer
Don B. Wafer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6007111Abstract: A system for sealing a wellhead, the system comprising: a wellhead housing for connecting to a well string casing, the wellhead housing being annularly disposed about a central axis comprising: a primary sealing surface disposed within the wellhead housing; a reference surface extending below the primary sealing surface; and a secondary sealing surface extending below the reference surface; a wellhead connector annularly disposed about the central axis having disposed therein a connector sealing surface; and a secondary seal ring annularly disposed about the central axis and comprising: a ring seal surface for sealing contact with the connector sealing surface; and an extension extending below the ring seal surface and having disposed thereon a sealing land extending from a lower portion of the extension for sealing contact with the wellhead housing.Type: GrantFiled: October 6, 1995Date of Patent: December 28, 1999Assignee: FMC CorporationInventor: Don B. Wafer
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Patent number: 5896925Abstract: According to the present invention, there is provided a device for guiding a tool on a string within a blow out prevention ("BOP") stack. In one embodiment, the device includes a top collar connected to a bottom collar by a shroud having a plurality of flexible members which bow outwardly from the collars, wherein the shroud covers a portion of the tool. An energy absorbing bumper is provided above the top collar to absorb structural impact caused by a blow out or other inadvertant pressure in a downhole application.Type: GrantFiled: November 17, 1997Date of Patent: April 27, 1999Assignee: FMC CorporationInventors: Gerald Brian Swagerty, David Earl Cain, John Robert Herold, Don B. Wafer, Randy Elum, Bashir M. Koleilat, Henry Wong
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Patent number: 5732731Abstract: In combination with a gate valve comprising a valve body having an internal cavity extending between an inlet port and an outlet port, a bonnet mounted to the valve body and having an internal passageway in communication with the cavity, a valve stem rotationally supported in the passageway, a handle connected to one end of the valve stem and a gate threadedly connected to the other end of the valve stem, the improvement comprising a first packing for sealing between the bonnet and the valve stem to prevent pressure within the cavity from escaping through the passageway, a second packing for sealing between the bonnet and the valve stem to prevent pressure within the cavity from escaping through the passageway, the second packing being located between the first packing and the cavity, a bypass port extending between a first portion of the passageway below the second packing and a second portion of the passageway above the second packing, and a bypass valve for selectively closing the bypass port such that theType: GrantFiled: September 24, 1996Date of Patent: March 31, 1998Assignee: FMC CorporationInventor: Don B. Wafer
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Patent number: 5730218Abstract: According to the present invention, there is provided a device for guiding a tool on a string within a blow out prevention ("BOP") stack. In one embodiment, the device includes a top collar connected to a bottom collar by a shroud having a plurality of flexible members which bow outwardly from the collars, wherein the shroud covers a portion of the tool. An energy absorbing bumper is provided above the top collar to absorb structural impact caused by a blow out or other inadvertant pressure in a downhole application.Type: GrantFiled: January 31, 1996Date of Patent: March 24, 1998Assignee: FMC CorporationInventors: Gerald Brian Swagerty, David Earl Cain, John Robert Herold, Don B. Wafer, Randy Elum, Bashir M. Koleilat, Henry Wong
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Patent number: 5511286Abstract: A handle for imparting rotational motion to a rotationally-operable device including a valve stem and shear pin assembly, the handle comprising an elongated arm having a hub section for receiving a modular hub, a hand grip attached to one end of the arm, and yoke means attached to the distal end of the arm, the modular hub having protrusions for linking the modular hub to the hub section to provide for the transfer of torque between the handle and the modular hub and internal voids for engageably receiving the valve stem and shear pin assembly.Type: GrantFiled: October 7, 1993Date of Patent: April 30, 1996Assignee: FMC CorporationInventors: Michael R. Williams, Richard D. Van Orsdale, Orlando A. Mejia, Don B. Wafer
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Patent number: 5404615Abstract: A handle for imparting rotational motion to a rotationally-operable device, which comprises an elongated arm having hub means for detachably connecting the handle to the rotationally-operable device, a hand grip attached to one end of the arm, and yoke means attached to the distal end of the arm.Type: GrantFiled: October 29, 1992Date of Patent: April 11, 1995Assignee: FMC CorporationInventors: Don B. Wafer, Michael R. Williams, Richard D. Van Orsdale, Orlando A. Mejia
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Patent number: 5221063Abstract: The invention is directed to a valve stem double backseat seal wherein the rising stem first engages a non-metallic radial seal and then axially engages the metal backseat shoulder of the valve bonnet.Type: GrantFiled: April 30, 1992Date of Patent: June 22, 1993Assignee: FMC CorporationInventors: Don B. Wafer, Michael R. Williams
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Patent number: 4848777Abstract: A casing seal for use with a source of high pressure fluids with apparatus for preventing shredding of the seal with variations in fluid pressure. A T-shaped annular metal ring provides a multiplication of fluid pressure so pressure exerted on an elastomeric sealing ring is greater than the fluid pressure. This multiplication prevents gases from entering the elastomer and prevents shredding of the elastomer when pressure is released. The multiplication of pressure also forces the elastomer firmly against a casing and a casing head to provide a fluid-tight seal.Type: GrantFiled: September 18, 1987Date of Patent: July 18, 1989Assignee: FMC CorporationInventors: David A. Zollo, Roy W. Benefield, David E. Cain, Phillip F. Huang, Brenda K. Montemayor, Ray Myers, Stephen L. Neeld, John C. Vicic, Don B. Wafer
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Patent number: 4711262Abstract: A gate valve includes a pressure relief port located on the gate valve. When the gate is positioned such that the port communicates with one of the two flow passages and the valve body interior, uni-directional flow is permitted from the other of the flow passages. Flow is blocked bi-directionally when the port is positioned out of communication with the flow passage.Type: GrantFiled: March 3, 1986Date of Patent: December 8, 1987Assignee: FMC CorporationInventors: Don B. Wafer, Claud C. Barrington