Patents by Inventor Arthur G. Ahlstone

Arthur G. Ahlstone 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).

  • Patent number: 5282755
    Abstract: A lamp lock for assembly of a fluorescent lamp with a lamp fixture is provided. A wafer-like body portion is made of electrically insulating material capable of use in the temperature range experienced by bi-pins of the fluorescent lamp. In use, the body portion is inserted between an axial end of the lamp and an adjacent face of the lamp fixture. The body portion has a leading edge and is provided with a slot extending through the leading edge for reception of the bi-pins. The lock further has a first lateral edge for sliding proximal engagement with a planar surface proximate to the lamp fixture for preventing the lock and the lamp from rotating, thereby securing the lamp to the lamp fixture. Preferably, the slot extends between, and in parallel alignment with, the first lateral edge and a second lateral edge of the body portion, such that the distance between the first lateral edge and the slot is greater than the distance between the second lateral edge and the slot.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: February 1, 1994
    Assignee: Vemco Corporation
    Inventor: Arthur G. Ahlstone
  • Patent number: 5207495
    Abstract: A graphic arts work center comprising a box having a bottom wall, upright side walls, and an associated frame; a light diffuser plate carried by the frame to overlie the bottom wall and define therewith an illumination space; illumination structure in the space to illuminate the underside of the diffuser plate; and a cover retained by the box to overlie the plate and to be upwardly removable to expose the plate for transmitting light to work placed over the plate; the box having auxiliary receptacle structure for storage of equipment usable in conjunction with use of the work placed over the plate.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: May 4, 1993
    Assignee: Vemco Corporation
    Inventor: Arthur G. Ahlstone
  • Patent number: 5069287
    Abstract: A retrievable guide base and gimbal unit for a subsea well, and a tool for use with a pipe running to retrieve the guide base and gimbal from the subsea wellhead.
    Type: Grant
    Filed: August 1, 1990
    Date of Patent: December 3, 1991
    Assignee: FMC Corporation
    Inventors: David E. Short, Arthur G. Ahlstone, William A. Valka
  • Patent number: 4880061
    Abstract: A packoff assembly for sealing the annulus between the outside surface of a tubing hanger and the internal bore of a subsea wellhead includes a packoff sleeve insertable in the annulus and a seal assembly on its lower end. A release sleeve is disposed around the upper end of the packoff sleeve and is axially movable with respect thereto. An internal shoulder on the packoff sleeve receives a lock ring on the tubing hanger when the seal assembly is set to lock the packoff assembly to the tubing hanger. Circumferentially spaced apart dogs on the packoff sleeve and radially slidable on the shoulder are forced inwardly by the release sleeve when it is pulled up to retract the lock ring from the shoulder and release the packoff assembly from the tubing hanger. A running tool for running the tubing hanger and packoff assembly into the well and setting the packoff includes telescoping upper and lower body members.
    Type: Grant
    Filed: October 14, 1987
    Date of Patent: November 14, 1989
    Assignee: Cameron Iron Works USA, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4736799
    Abstract: A packoff assembly for sealing the annulus between the outside surface of a tubing hanger and the internal bore of a subsea wellhead includes a packoff sleeve insertable in the annulus and a seal assembly on its lower end. A release sleeve is disposed around the upper end of the packoff sleeve and is axially movable with respect thereto. An internal shoulder on the packoff sleeve receives a lock ring on the tubing hanger when the seal assembly is set to lock the packoff assembly to the tubing hanger. Circumferentially spaced apart dogs on the packoff sleeve and radially slidable on the shoulder are forced inwardly by the release sleeve when it is pulled up to retract the lock ring from the shoulder and release the packoff assembly from the tubing hanger. A running tool for running the tubing hanger and packoff assembly into the well and setting the packoff includes telescoping upper and lower body members.
    Type: Grant
    Filed: January 14, 1987
    Date of Patent: April 12, 1988
    Assignee: Cameron Iron Works USA, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4618285
    Abstract: A method and apparatus are described for the installation and removal of a ring gasket from a ring gasket retainer assembly which forms a part of an underwater wellhead connection. A buoyant ring gasket installation tool, tethered to an underwater vehicle, carries the gasket to the wellhead connection. Due to the buoyancy of the installation tool it floats above the underwater vehicle. By proper placement of the tool beneath an opening defined upwardly through the wellhead connection the tool may float the ring gasket upwardly through the opening and position the ring gasket properly with respect to the ring gasket retainer assembly, which may then be actuated to retain the gasket within the underwater wellhead connection.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: October 21, 1986
    Assignee: Shell Offshore Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4602893
    Abstract: A method and apparatus are described for the installation and removal of a ring gasket from an underwater wellhead connection. The ring gasket is carried by a ring gasket installation tool from the surface to the underwater wellhead connection by a self-propelled underwater vehicle. Final placement of the ring gasket may be accomplished by selective manipulation of the ring gasket installation tool by the underwater vehicle or by a cable attached to the tool.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: July 29, 1986
    Assignee: Shell Offshore Inc.
    Inventors: Tun C. Gist, Arthur G. Ahlstone
  • Patent number: 4601608
    Abstract: A hydraulic connection apparatus for use by divers or an underwater vehicle is disclosed which allows pressurized hydraulic fluid to be supplied to hydraulically-actuated devices carried upon subsea equipment. A pressurized fluid source carried by the underwater vehicle is placed in fluid communication with the hydraulically-actuated devices by the connection apparatus. The connection apparatus comprises a buoyant device that is allowed to float upwardly into a receptacle carried by a portion of the subsea equipment. Co-operating hydraulic connection elements carried by the buoyant device and the receptacle provide a pressure tight seal between the device and the receptacle. Pressurized hydraulic fluid then flows from the buoyant device and through the receptacle to the hydraulically-actuated devices carried upon the subsea equipment.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: July 22, 1986
    Assignee: Shell Offshore Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4444421
    Abstract: Connections for attaching together successive sections of an axially driveable pile, including pin and box ends having engaging threads which are tapered and which as viewed in axial section have opposite side faces both disposed at a very small angle of not over about 5.5 degrees with respect to a line extending perpendicular to and intersecting the axis of the threaded connection, preferably between about 4.5 and 5.5 degrees, so that the threads can take very high axial driving and rebounding forces. Each thread desirably has an axial thickness at its pitch line at least about one and one-half times the height of the thread from its root to its crest. The pin and box elements preferably do not have shoulders engageable to limit the extent to which the parts can be screwed together in the fully made-up condition of the joint.
    Type: Grant
    Filed: November 12, 1980
    Date of Patent: April 24, 1984
    Assignee: Varco International, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4294477
    Abstract: A ring gasket is retainer in position on a pipe connector flange with the ring gasket properly positioned for sealing engagement and loading between opposed circular grooves in the flange and a mating flange or member. The ring gasket is supported on one of the connector parts by a spacer ring or by a portion of the flange which effects a standoff between the connector parts when they are connected. The support for the ring gasket includes a flexible connection between the inside of the spacer ring and the outer periphery of the ring gasket. The ring gasket has outer peripheral, oppositely tapered sealing surfaces loaded into sealing engagement with opposing companion surfaces forming the grooves in the flanges upon making up of the connection, and the flexible connection between the spacer ring and the ring gasket permits such axial movement of the ring gasket as is necessary to enable loading thereof.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: October 13, 1981
    Assignee: Vetco Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4272109
    Abstract: A ring gasket is retained in position on a pipe connector flange with the ring gasket properly positioned for sealing engagement and loading between opposed circular grooves in the flange and a mating flange or member. The ring gasket is supported, in some forms, at its outer periphery by a member connected to one of the connector parts between opposed abutting surfaces of the connector parts when they are connected. The ring gasket is increased in size, from a standard, to compensate for the standoff, so that the ring gasket is properly loaded. The support for the ring gasket, in another form, includes a direct connection between the ring gasket and the flange or support means, and in other forms, the ring gasket is supported at its inner periphery, and can not affect abutment between the flanges. The ring gasket has peripheral, oppositely tapered sealing surfaces loaded into sealing engagement with opposing companion surfaces forming the grooves in the flanges upon making up of the connection.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: June 9, 1981
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4209193
    Abstract: A stab type connector for large diameter pipe has a pin structure and a box structure held in interconnected relation by a locking and loading ring between a circumferential shoulder in the pin structure and a circumferential shoulder on a threaded locking and loading sleeve of the box structure with confronting circumferential pin structure and box structure seating surfaces loaded into engagement. The coengaged and loaded sleeve shoulder and ring and coengaged pin and box structure surfaces transmit axial forces through the connector and resist bending. The connector is useful as a conductor pipe or pile connector.
    Type: Grant
    Filed: May 17, 1977
    Date of Patent: June 24, 1980
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4168852
    Abstract: A ring gasket is retained in position on a pipe connector flange with the ring gasket properly positioned for sealing engagement and loading between opposed circular grooves in the flange and a mating flange or member. The ring gasket is supported on one of the connector parts by a spacer ring or by a portion of the flange which effects a standoff between the connector parts when they are connected. In the case of a separate spacer ring, it is connected to the flange or supported adjacent to the groove by a support member adapted to be hand-held. The support for the ring gasket includes elements frictionally engaging or biting into the outer periphery of the ring gasket. The ring gasket has outer peripheral, oppositely tapered sealing surfaces loaded into sealing engagement with opposing companion surfaces forming the grooves in the flanges upon making up of the connection.
    Type: Grant
    Filed: June 8, 1977
    Date of Patent: September 25, 1979
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4168853
    Abstract: A ring gasket is retained in position on a pipe connector flange with the ring gasket properly positioned for sealing engagement and loading between opposed circular grooves in the flange and a mating flange or member. The ring gasket is supported on one of the connector parts by a spacer ring or by a portion of the flange which effects a standoff between the connector parts when they are connected. The support for the ring gasket includes a flexible connection between the inside of the spacer ring and the outer periphery of the ring gasket. The ring gasket has outer peripheral, oppositely tapered sealing surfaces loaded into sealing engagement with opposing companion surfaces forming the grooves in the flanges upon making up of the connection, and a slidable connection between the spacer ring and the ring gasket supports the ring gasket for such axial movement of the ring gasket as is necessary to enable loading thereof.
    Type: Grant
    Filed: June 8, 1977
    Date of Patent: September 25, 1979
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4153281
    Abstract: A misalignment connector has a pair of hubs providing internal, opposed spherical surfaces loaded into engagement with an internal, metal sealing ring having a spherical, outer sealing surface, the hubs being constrained together to maintain loading of the seal ring over a range of angles of misalignment. The internal seal ring is initially retained in position with respect to one of the hubs and is shiftable for proper sealing and loading engagement by the hubs over the range of permissible misalignment. The metal-to-metal seal between the hubs and the seal ring is backed up by a resilient seal. The metal seal ring has an outer peripheral projection forming a connection for the retainer, and the projection is engageable by the hubs to angularly shift the seal ring during assembly.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: May 8, 1979
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4153278
    Abstract: A misalignment connector for large pipelines, conductor pipes or the like, includes an internal, metal seal ring having an external spherical periphery which is axially and circumferentially loaded between opposed internal spherical surfaces of connector structures which are operable by hydraulic piston and cylinder means to be interconnected over a range of angular misalignment. The internal sealing ring is preloaded when the connector parts are secured together. Initially, the internal sealing ring is supported in or nearly in engagement with one of the companion spherical surfaces of the connector parts for proper engagement and angular motion upon the interconnection of the connector parts over the permissible angular range of misalignment. The connector is made up by the application of fluid pressure to the actuator cylinder and piston means after the connector parts have been stabbed together. Radially shiftable locking elements are wedged towards one another by the action of the actuator cylinders.
    Type: Grant
    Filed: September 19, 1977
    Date of Patent: May 8, 1979
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4133558
    Abstract: A misalignment connector for large pipelines includes an internal, metal seal ring having an external spherical surface which is axially and circumferentially loaded between opposed internal spherical metal surfaces of pipe connector hubs having parts engaged with holding means having spherical surfaces enabling the connector to be made up with the pipe connector hubs disposed over a range of angular misalignment and with the sealing ring loaded axially and inwardly when the connector body parts are secured together by the holding means to prevent relaxation of the preload on the sealing ring. The metal sealing ring is initially supported on one of the hubs by means enabling relative angular motion of the sealing ring as it is loaded between misaligned hubs. The hubs are provided with thrust surfaces enabling them to be initially preloaded against the sealing ring by a loading tool.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: January 9, 1979
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4133557
    Abstract: A misalignment conductor for large pipelines or conductor pipes includes an internal, metal seal ring having an external spherical surface which is axially and circumferentially loaded between opposed internal spherical metal surfaces of connector hubs. Connector body parts engaged with or formed on the pipe connector ends or hubs have spherical surfaces enabling the connector to be made up with the pipe connector hubs disposed over a range of angular misalignment. The sealing ring is preloaded by a loading tool when the connector body parts are secured together to prevent relaxation of the preload on the sealing ring. The metal sealing ring is initially supported on one of the hubs by means enabling angular adjustment of the sealing ring as it is loaded between misaligned hubs.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: January 9, 1979
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4124231
    Abstract: A pipe connector has a pin initially stabbed into a box, the pin and box then being axially loaded together at confronting transverse surfaces while the pin and box are pressurized to expand the box and compress the pin, so that when the pressure is relieved a pressure energized shrink fit is provided and the connector is rendered rigid to enhance tensile, compressive and bending strength and provide a fluid tight joint useful in making up lengths of pipe such as piles and pipelines. Lock means hold the connector against axial separation to maintain the pin under axial compression and maintain the box under axial tension, including circumferentially spaced locking elements projecting radially from one of said pin and box into a locking recess of the other of said pin and box.
    Type: Grant
    Filed: May 4, 1977
    Date of Patent: November 7, 1978
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone
  • Patent number: 4124229
    Abstract: A pipe connector has a pin initially stabbed into a box, the pin and box then being axially loaded together at confronting transverse surfaces while the pin and box are pressurized to expand the box and compress the pin, so that when the pressure is relieved a pressure energized shrink fit is provided and the connector is rendered rigid to enhance tensile, compressive and bending strength and provide a fluid tight joint useful in making up lengths of pipe such as piles and pipelines.
    Type: Grant
    Filed: May 4, 1977
    Date of Patent: November 7, 1978
    Assignee: Vetco, Inc.
    Inventor: Arthur G. Ahlstone