Patents by Inventor Glen C. Wieland

Glen C. Wieland 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).

  • Sub-mudling casing hanger/packoff
    Patent number: 4969517
    Abstract: A well casing hanger/packoff apparatus with ports through which fluids can be circulated during installation and cementing operations, and a sleeve-type valve that can be moved axially to open or close the ports as desired.
    Type: Grant
    Filed: August 25, 1989
    Date of Patent: November 13, 1990
    Assignee: FMC Corporation
    Inventors: William A. Valka, Glen C. Wieland