Patents by Inventor David E. Stikkers

David E. Stikkers 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).

  • Glass fiber reinforced cement liners for pipelines and casings
    Patent number: 5649568
    Abstract: Conduits having cement-containing liners for the inner and outer surfaces of metal pipes include a fibrous material, such as glass fibers, to prevent cracking and/or inhibit crack propagation.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: July 22, 1997
    Assignee: Union Oil Company of California
    Inventors: William C. Allen, David E. Stikkers, Daniel P. Hoyer
  • Dual gasket lined pipe connector
    Patent number: 5566986
    Abstract: A multi-piece, pipe joint seal has a slidable interface between seal pieces. The slidable interface allows for slippage between pieces during pipe joint assembly and disassembly, minimizing rotational and other stresses on the seal pieces and pipe sealing surfaces which may damage or endanger the deformable seal. The slidable interface seal is especially useful for joining brittle-lined pipe sections handling harsh fluids.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: October 22, 1996
    Assignee: Union Oil Company of California
    Inventors: William C. Allen, William M. Rickard, Daniel P. Hoyer, David E. Stikkers, Matthew J. Kelley
  • Dual gasket lined pipe connector
    Patent number: 5405171
    Abstract: A multi-piece, pipe joint seal has a slidable interface between seal pieces. The slidable interface allows for slippage between pieces during pipe joint assembly and disassembly, minimizing rotational and other stresses on the seal pieces and pipe sealing surfaces which may damage or endanger the deformable seal. The slidable interface seal is especially useful for joining brittle-lined pipe sections handling harsh fluids.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: April 11, 1995
    Assignee: Union Oil Company of California
    Inventors: William C. Allen, William M. Rickard, Daniel P. Hoyer, David E. Stikkers, Matthew L. Kelley