Patents by Inventor Vincent F. Marquez, Jr.

Vincent F. Marquez, Jr. 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).

  • Valve and sensing device for well conduits
    Patent number: 4465139
    Abstract: A method and apparatus for installing in a well conduit by a single trip on an auxiliary conduit a combination well condition sensing device and flow cut off valving elements. The cooperating valving elements are of annular configuration and the auxiliary conduit passes through the bore of the valving elements and is mechanically connected to one of the valving elements. The entire apparatus may be run into the well conduit in a single trip on the auxiliary conduit and actuated to a flow shut off position by longitudinal manipulation of the apparatus. Pressurization of the upper well conduit and secondary manipulation of the apparatus and the auxiliary conduit permits the return of the valving elements to an open flow position.
    Type: Grant
    Filed: April 30, 1982
    Date of Patent: August 14, 1984
    Assignee: Baker Oil Tools, Inc.
    Inventors: Vincent F. Marquez, Jr., R. Edward Payne, Thomas L. Loveday, Robert J. Gunn