Patents by Inventor David Shahin
David Shahin 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: 9991354Abstract: Systems and methods are provided that enable the production of semiconductor devices having a metal nitride layer in direct contact with a semiconductor layer to form a Schottky diode, such as a TiN gate on an AlGaN/GaN high electron mobility transistor (HEMT). Metal nitrides offer exceptional thermal stability and a lower diffusion coefficient. Technology enabled by embodiments of the present disclosure improves the reliability of GaN-based microwave power transistors.Type: GrantFiled: May 16, 2017Date of Patent: June 5, 2018Assignee: The United States of America, as represented by the Secretary of the NavyInventors: Travis J. Anderson, Virginia D. Wheeler, David Shahin, Andrew D. Koehler, Karl D. Hobart, Francis J. Kub, Marko J. Tadjer
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Publication number: 20170330950Abstract: Systems and methods are provided that enable the production of semiconductor devices having a metal nitride layer in direct contact with a semiconductor layer to form a Schottky diode, such as a TiN gate on an AlGaN/GaN high electron mobility transistor (HEMT). Metal nitrides offer exceptional thermal stability and a lower diffusion coefficient. Technology enabled by embodiments of the present disclosure improves the reliability of GaN-based microwave power transistors.Type: ApplicationFiled: May 16, 2017Publication date: November 16, 2017Inventors: Travis J. Anderson, Virginia D. Wheeler, David Shahin, Andrew D. Koehler, Karl D. Hobart, Francis J. Kub, Marko J. Tadjer
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Patent number: 8281877Abstract: A top drive system includes a top drive, top drive adapter, and a tubular positioning apparatus. In another aspect, the top drive adapter includes a housing operatively connected to the top drive and a plurality of retaining members disposed in the housing for gripping the tubular. In another aspect, the tubular positioning apparatus includes a gripping member for engaging a tubular and a conveying member for positioning the gripping member. A spinner may be provided to rotate the tubular.Type: GrantFiled: September 24, 2008Date of Patent: October 9, 2012Assignee: Weatherford/Lamb, Inc.Inventors: David Shahin, Jeff Habetz, David M. Haugen, Gary Thompson, Bernd-Georg Pietras, Jimmy L. Hollingsworth, Bernd Reinholdt
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Patent number: 8020627Abstract: Embodiments of the present invention generally relate to an apparatus for supporting a tubular that more evenly distributes stress along the contact length of a tubular. In one embodiment, an apparatus for supporting a tubular is provided. The apparatus includes a bowl having a longitudinal opening extending therethrough and an inner surface for receiving a gripping member. The gripping member is movable along the surface of the bowl for engaging the tubular. The apparatus is configured so that an upper portion of the gripping member will engage the tubular before the rest of the gripping member engages the tubular.Type: GrantFiled: January 15, 2010Date of Patent: September 20, 2011Assignee: Weatherford/Lamb, Inc.Inventors: David Shahin, Karsten Heidecke
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Patent number: 7845418Abstract: A method and apparatus for providing additional torque in a top drive system for rotating a tubular during tubular drilling, running, and/or handling operations. In one embodiment, a gear arrangement is operatively connected to a top drive of the top drive system to increase the amount of available torque for rotating a tubular. In another embodiment, a gear box is operatively connected to the top drive to boost the amount of torque available for rotating the tubular.Type: GrantFiled: January 18, 2006Date of Patent: December 7, 2010Assignee: Weatherford/Lamb, Inc.Inventors: David Shahin, Karsten Heidecke
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Patent number: 7712523Abstract: A torque head for gripping tubular members, in at least some aspects, has a housing, grip mechanism secured within the housing, the grip mechanism for selectively gripping a tubular member, the grip mechanism including at least one jaw selectively movable toward and away from a portion of a tubular member within the housing, the at least one jaw having mounted thereon slip apparatus for engaging the portion of the tubular member, the slip apparatus including die apparatus movably mounted to the at least one jaw, the die apparatus movable with respect to the at least one jaw so that relative movement of the tubular with respect to the torque head is possible to the extent that the die apparatus is movable.Type: GrantFiled: March 14, 2003Date of Patent: May 11, 2010Assignee: Weatherford/Lamb, Inc.Inventors: Randy Gene Snider, David Shahin, Jim Allen, Kevin Gray, Gary Thompson
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Publication number: 20100108330Abstract: Embodiments of the present invention generally relate to an apparatus for supporting a tubular that more evenly distributes stress along the contact length of a tubular. In one embodiment, an apparatus for supporting a tubular is provided. The apparatus includes a bowl having a longitudinal opening extending therethrough and an inner surface for receiving a gripping member. The gripping member is movable along the surface of the bowl for engaging the tubular. The apparatus is configured so that an upper portion of the gripping member will engage the tubular before the rest of the gripping member engages the tubular.Type: ApplicationFiled: January 15, 2010Publication date: May 6, 2010Inventors: David Shahin, Karsten Heidecke
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Patent number: 7694744Abstract: Embodiments of the present invention include methods and apparatus for circulating fluid through casing and filling the casing with fluid using a combination fill-up and circulating tool while maintaining the fill-up/circulating tool in substantially the same position relative to the casing. In one embodiment, the fill-up/circulating tool includes a mandrel insertable into casing and having a sealing element therearound, the sealing element capable of sealingly engaging with an outer diameter of the mandrel to permit circulating fluid through the casing. The fill-up/circulating tool is also capable of allowing air flow around the outer diameter of the mandrel for the operation of filling the casing with fluid without the need to move the mandrel within the casing.Type: GrantFiled: January 12, 2006Date of Patent: April 13, 2010Assignee: Weatherford/Lamb, Inc.Inventor: David Shahin
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Patent number: 7686088Abstract: Embodiments of the present invention generally relate to an apparatus for supporting a tubular that more evenly distributes stress along the contact length of a tubular. In one embodiment, an apparatus for supporting a tubular is provided. The apparatus includes a bowl having a longitudinal opening extending therethrough and an inner surface for receiving a gripping member. The gripping member is movable along the surface of the bowl for engaging the tubular. The apparatus is configured so that an upper portion of the gripping member will engage the tubular before the rest of the gripping member engages the tubular.Type: GrantFiled: May 10, 2006Date of Patent: March 30, 2010Assignee: Weatherford/Lamb, Inc.Inventor: David Shahin
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Patent number: 7665551Abstract: A gripping apparatus for supporting a tubular includes a longitudinal opening extending therethrough. A bowl is formed on an inner wall of the housing to provide an incline surface for one or more gripping members. As the gripping members are move down along the incline, the incline causes the gripping members to move radially toward the tubular and contact the tubular. In one embodiment, the housing comprises two body portions coupled together using one or mores hinges. In one aspect, the bowl is formed as a recess in the inner wall of the housing. The hinges of the housing are progressively curved to accommodate the recess bowl, thereby increasing the tubular size handling capacity of the gripping apparatus. In another embodiment, the apparatus may include guide keys that mate with guide slots formed on an outer surface of the gripping members to minimize the rotational movement of the gripping members relative to the housing.Type: GrantFiled: December 4, 2006Date of Patent: February 23, 2010Assignee: Weatherford/Lamb, Inc.Inventors: David Shahin, Karsten Heidecke
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Patent number: 7654325Abstract: The present invention provides a method and apparatus for handling tubulars and drilling with tubulars such as casing into a formation. In one aspect of the invention, the apparatus comprises a circulating head and a cementing head operatively connectible to a gripping member. The circulating head is used to circulate drilling fluid while drilling with casing, and the cementing head is used to cement the casing string within the formation at a desired depth. The present invention also relates to methods and apparatus for isolating a tensile load from a drilling apparatus rotated by a top drive. In one aspect, the present invention provides a load isolator apparatus having an isolator body operatively connected to the top drive and a torque body at least partially disposed in the isolator body. In operation, the bearing assembly transfers the tensile load from the torque body to the isolator body.Type: GrantFiled: October 31, 2007Date of Patent: February 2, 2010Assignee: Weatherford/Lamb, Inc.Inventors: Richard L. Giroux, David Shahin, Adrian Vuyk, Jr., Gary Thompson, Kevin Leon Gray, John Timothy Allen, Randy Gene Snider
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Patent number: 7594540Abstract: A method and apparatus for connecting threaded members while ensuring that a proper connection is made. In one embodiment, the applied torque and/or rotation are measured at regular intervals throughout a pipe connection makeup. When a shoulder contact is detected, a predetermined torque value and/or rotation value is added to the measured torque and/or rotation values, respectively, at shoulder contact and rotation continued until this calculated value(s) is reached.Type: GrantFiled: October 31, 2007Date of Patent: September 29, 2009Assignee: Weatherford/Lamb, Inc.Inventors: Thomas Koithan, Graham Ruark, John W. Newman, David M. Haugen, David Shahin
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Publication number: 20090101332Abstract: Methods and apparatus for drilling with a top drive system are provided. In one aspect, the present invention provides for a top drive system having includes a top drive, top drive adapter, and a tubular positioning apparatus. In one another aspect, the system includes a telescopic link system connected to a lower portion of the top drive adapter to move the casing string into engagement with the top drive adapter. In another aspect, the top drive adapter includes a housing operatively connected to the top drive and a plurality of retaining members disposed in the housing for gripping the tubular. In another aspect, the tubular positioning apparatus includes a gripping member for engaging a tubular and a conveying member for positioning the gripping member. A spinner may be provided to rotate the tubular.Type: ApplicationFiled: September 24, 2008Publication date: April 23, 2009Inventors: David Shahin, Jeff Habetz, David M. Haugen, Gary Thompson, Bernd-Georg Pietras, Jimmy L. Hollingsworth, Bernd Reinholdt
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Patent number: 7509722Abstract: The present invention generally relates to a method and apparatus for connecting a first tubular with a second tubular. The apparatus includes a gripping member for engaging the first tubular and a conveying member for positioning the gripping member. The apparatus also includes a spinner for rotating the first tubular. In one embodiment, the spinner includes a motor and one or more rotational members for engaging the first tubular. In another embodiment, the apparatus includes a rotation counting member biased against the first tubular. In another aspect, the present invention provides a method of connecting a first tubular to second tubular. The method includes engaging the first tubular using a gripping member connected to a conveying member and positioning the gripping member to align the first tubular with the second tubular. Thereafter, the first tubular is engaged with the second tubular, and the first tubular is rotated relative to the second tubular using the gripping member.Type: GrantFiled: March 5, 2003Date of Patent: March 31, 2009Assignee: Weatherford/Lamb, Inc.Inventors: David Shahin, Jeff Habetz, Jimmy Lawrence Hollingsworth, Bernd Reinholdt
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Patent number: 7503397Abstract: In one embodiment, a top drive system for drilling with casing is provided with an access tool to retrieve a downhole tool. The top drive system for drilling with casing comprises a top drive; a top drive adapter for gripping the casing, the top drive adapter operatively coupled to the top drive; and an access tool coupled to the top drive and adapted for accessing a fluid passage of the top drive system. In another embodiment, a method for retrieving a downhole tool through a tubular coupled to a top drive adapter of a top drive system is provided. The method comprises coupling an access tool to the top drive system, the access tool adapted to provide access to a fluid path in the top drive system and inserting a conveying member into the fluid path through the access tool.Type: GrantFiled: July 29, 2005Date of Patent: March 17, 2009Assignee: Weatherford/Lamb, Inc.Inventors: Richard Lee Giroux, Albert C. Odell, II, Gary Thompson, David Haugen, Tuong Thanh Le, Robert Dugal, Karsten Heidecke, David Shahin
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Patent number: 7448456Abstract: The present invention provides a method and apparatus for gripping one or more tubulars, which may include casing, during a tubular handling operation, drilling operation, and/or drilling with casing operation. The gripping apparatus comprises a housing having a bore extending therethrough and one or more gripping members which extend radially within the bore to grippingly engage a tubular or casing when activated. Adjustable guides attached to a portion of the gripping apparatus facilitate rotational movement of the casing during the drilling operation when the gripping members of the gripping apparatus are deactivated.Type: GrantFiled: February 1, 2006Date of Patent: November 11, 2008Assignee: Weatherford/Lamb, Inc.Inventors: David Shahin, Karsten Heidecke
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Publication number: 20080059073Abstract: The present invention provides a method and apparatus for handling tubulars and drilling with tubulars such as casing into a formation. In one aspect of the invention, the apparatus comprises a circulating head and a cementing head operatively connectible to a gripping member. The circulating head is used to circulate drilling fluid while drilling with casing, and the cementing head is used to cement the casing string within the formation at a desired depth. The present invention also relates to methods and apparatus for isolating a tensile load from a drilling apparatus rotated by a top drive. In one aspect, the present invention provides a load isolator apparatus having an isolator body operatively connected to the top drive and a torque body at least partially disposed in the isolator body. In operation, the bearing assembly transfers the tensile load from the torque body to the isolator body.Type: ApplicationFiled: October 31, 2007Publication date: March 6, 2008Inventors: Richard Giroux, David Shahin, Adrian Vuyk, Gary Thompson, Kevin Gray, John Allen, Randy Snider
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Publication number: 20080047749Abstract: A method and apparatus for connecting threaded members while ensuring that a proper connection is made. In one embodiment, the applied torque and/or rotation are measured at regular intervals throughout a pipe connection makeup. When a shoulder contact is detected, a predetermined torque value and/or rotation value is added to the measured torque and/or rotation values, respectively, at shoulder contact and rotation continued until this calculated value(s) is reached.Type: ApplicationFiled: October 31, 2007Publication date: February 28, 2008Inventors: Thomas Koithan, Graham Ruark, John Newman, David Haugen, David Shahin
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Patent number: 7325610Abstract: The present invention provides a method and apparatus for handling tubulars and drilling with tubulars such as casing into a formation. In one aspect of the invention, the apparatus comprises a circulating head and a cementing head operatively connectible to a gripping member. The circulating head is used to circulate drilling fluid while drilling with casing, and the cementing head is used to cement the casing string within the formation at a desired depth. The present invention also relates to methods and apparatus for isolating a tensile load from a drilling apparatus rotated by a top drive. In one aspect, the present invention provides a load isolator apparatus having an isolator body operatively connected to the top drive and a torque body at least partially disposed in the isolator body. In operation, the bearing assembly transfers the tensile load from the torque body to the isolator body.Type: GrantFiled: March 5, 2004Date of Patent: February 5, 2008Assignee: Weatherford/Lamb, Inc.Inventors: Richard L. Giroux, David Shahin, Adrian Vuyk, Jr., Gary Thompson, Kevin Leon Gray, John Timothy Allen, Randy Gene Snider
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Patent number: 7296623Abstract: A method and apparatus for connecting threaded members while ensuring that a proper connection is made. In one embodiment, the applied torque and/or rotation are measured at regular intervals throughout a pipe connection makeup. When a shoulder contact is detected, a predetermined torque value and/or rotation value is added to the measured torque and/or rotation values, respectively, at shoulder contact and rotation continued until this calculated value(s) is reached.Type: GrantFiled: November 25, 2003Date of Patent: November 20, 2007Assignee: Weatherford/Lamb, Inc.Inventors: Thomas Koithan, Graham Ruark, John W. Newman, David M. Haugen, David Shahin