Patents by Inventor David W. Campbell

David W. Campbell 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: 6119573
    Abstract: Carbon fiber material and carbon fiber material that is saturated with hydrocarbon solid-liquid phase change material may be used as thermal management materials for providing a thermally conductive interface between a heat source and its housing. Such carbon fiber material may also be used for mechanical isolation of the heat source from its housing. Carbon fibers used in the carbon fiber material may be unidirectionally oriented to provide for low friction, thus optimizing critically controlled friction tolerances. Additionally the carbon fiber material saturated with hydrocarbon solid-liquid phase change material may be used to transfer heat into the an inherently nonconductive medium.
    Type: Grant
    Filed: January 27, 1997
    Date of Patent: September 19, 2000
    Assignee: Raytheon Company
    Inventors: Thomas J. Berens, David W. Campbell, Peter J. Drake, Timothy R. Knowles, Timothy B. Mellor
  • Patent number: 6095241
    Abstract: A device for connection to a wellhead for coupling a drive assembly for a downhole pump with an apparatus having a rotatable member for driving the apparatus. A rotatable first shaft, having a first end and a longitudinal axis, is associated with the drive assembly such that the first shaft is rotated thereby. A rotatable connector, having driven and drive ends, connects the first shaft with the rotatable member such that rotation of the first shaft rotates the connector. The driven end connects with the first end of the first shaft. The drive end connects with the rotatable member. A rotatable coupler, having driven and drive ends and a longitudinal axis, connects the first shaft with the connector. The driven end of the coupler connects with the first end of the first shaft. The drive end of the coupler connects with the driven end of the connector.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: August 1, 2000
    Assignee: Campbell Industries Ltd.
    Inventors: Linden H. Bland, David W. Campbell
  • Patent number: 6026898
    Abstract: A tubing head is provided for accommodating a rotator. The rotator includes a drive gear and a swivel tubing hanger which engages an internal surface of the tubing head and comprises a driven gear for engaging the drive gear. The tubing head defines a gear housing for the drive gear so that the drive gear may releasably engage the driven gear. The internal surface, gear housing and drive and driven gears are configured such that when the drive gear is in the gear housing, the tubing hanger engages the internal surface and the drive and driven gears are engaged, the tubing hanger may be removed from the tubing head by pulling it through the upper end without first disengaging the drive and driven gears. An apparatus is also provided comprising the tubing head, the swivel tubing hanger and the drive gear.
    Type: Grant
    Filed: November 11, 1997
    Date of Patent: February 22, 2000
    Assignee: Campbell Industries Ltd.
    Inventors: Linden H. Bland, David W. Campbell
  • Patent number: 5391656
    Abstract: A method of recovering and recycling monomers from a gas phase olefins polymerization reactor through the use of the monomer feed stream. A high pressure monomer source is reduced in pressure so as to reduce the temperature of the monomer source. The monomer source is then used to cool and condense monomers contained in various vent gas streams. The condensed monomers are then separated from the gas stream and recycled back to the reactor.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: February 21, 1995
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: David W. Campbell, Randall L. Force, Kelli L. Campbell
  • Patent number: 5206979
    Abstract: A specialty paint finish roller composed of a substantially conventional roller handle assembly having an axle, a roller tube, a pair of bushings for rotatably interfacing with the at least one axle of the roller handle assembly, and a disposable, generally cylindrically shaped rag component twisted around the roller tube, tucked into the axial cavity of the roller tube at either end thereof and secured thereto by a press fit of the bushings with respect to the axial cavity of the roller tube. The rag component is more or less twisted with respect to the roller tube. A specialty finish is provided by the specialty paint finish roller using either the positive application method or the negative application method. Rag components are easily replaceable during the job in order to achieve a maximally artistic result, as could formerly only be achievable using hands-on rag rolling techniques.
    Type: Grant
    Filed: April 7, 1992
    Date of Patent: May 4, 1993
    Inventor: David W. Campbell
  • Patent number: 4693826
    Abstract: This invention describes an overflow system for a slurry storage chamber which chamber has a slurry input pipe tangentially mounted through a side wall of the tank to create a vortex. The overflow portion is designed to have a pressure confining top to the tank with the overflow pipe connected near the center of the top. A conically shaped baffle is inserted in the tank with its axis aligned with the axis of the overflow pipe and positioned immediately below the overflow pipe. The overflow configuration provides a means for separating the particles from the fluids passing out through the overflow pipe.
    Type: Grant
    Filed: February 18, 1986
    Date of Patent: September 15, 1987
    Assignee: Conoco Inc.
    Inventors: Jeffrey L. Beck, David W. Campbell
  • Patent number: 4676810
    Abstract: Slurries containing solid liquids and gases are continuously separated into individual components utilizing a revolving vanes on an eccentric axis. The vanes are of a flexible material which revolve sufficiently slowly that in sequence gas escapes through an overhead mesh, water is separated through a lower mesh and solids exit through a lower opening. The slurry input is from the axis plane overhead of the axis and input rate is balanced with gas, water and solids output.
    Type: Grant
    Filed: June 19, 1986
    Date of Patent: June 30, 1987
    Assignee: Conoco Inc.
    Inventors: Ahmed A. El-Saie, David W. Campbell