Patents by Inventor Charles Donovan Morrill

Charles Donovan Morrill 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).

  • Seal
    Patent number: 4056272
    Abstract: An oil well pipe suspension apparatus including a wellhead having a pipe hanger supported therein and a christmas tree supported thereon, a frusto-conical metal gasket providing a metal-to-metal seal between the hanger and the wellhead, and an "X" cross section resilient metal gasket providing a metal-to-metal seal between the hanger and the christmas tree.
    Type: Grant
    Filed: September 10, 1975
    Date of Patent: November 1, 1977
    Inventor: Charles Donovan Morrill