Patents by Inventor Malcolm B. Roach

Malcolm B. Roach 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).

  • Well valve
    Patent number: 4372390
    Abstract: Disclosed are apparatus and method of closing a conduit against fluid flow in at least one longitudinal sense, and selectively disengaging and reengaging the closure mechanism without removing the closure mechanism from the conduit. In a particular embodiment, a valve assembly may be selectively anchored and sealed to a well packer, or disengaged therefrom. The valve assembly is manipulated by an operating tool to which the valve assembly is anchored in the well when the valve assembly is disengaged from the packer.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: February 8, 1983
    Assignee: Hughes Tool Company
    Inventors: John L. Baugh, James W. Montgomery, Malcolm B. Roach