Patents by Inventor William H. Bear

William H. Bear 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).

  • Thin-walled small-bore steel tube with case hardened internal surface
    Patent number: 4949758
    Abstract: The present invention relates to a process for hardening the interior surface of a long, thin-walled, small inside diameter, tubular member, such as a tube which would be used to form a downhole pump barrel. More particularly, it relates to a process involving progressive heating with an internally positioned, electro-magnetic induction coil, followed by immediate quenching with a quench ring assembly, to develop a martensitic case on the inner surface of the tube. The invention further extends to the apparatus utilized in conducting the process, and to the product tube itself.
    Type: Grant
    Filed: July 17, 1985
    Date of Patent: August 21, 1990
    Assignee: Quinn'S Oilfield Supply Ltd.
    Inventor: William H. Bear
  • Process for making internally hardened tubes
    Patent number: 4844752
    Abstract: The present invention relates to a process for hardening the interior surface of a long, thin-walled, small inside diameter, tubular member, such as a tube which would be used to form a downhole pump barrel. More particularly, it relates to a process involving progressive heating with an internally positioned, electro-magnetic induction coil, followed by immediate quenching with a quench ring assembly, to develop a martensitic case on the inner surface of the tube. The invention further extends to the apparatus utilized in conducting the process, and to the product tube itself.
    Type: Grant
    Filed: October 6, 1986
    Date of Patent: July 4, 1989
    Assignee: Quinn's Oilfield Supply Ltd.
    Inventor: William H. Bear