Patents by Inventor Roy S. G. Lagerqvist

Roy S. G. Lagerqvist 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).

  • Pressure responsive sealing means
    Patent number: 4132417
    Abstract: A sealing device such as a piston ring has an L shaped cross section with primary and secondary sealing surfaces held in contact. The device is mounted in a groove to dispose the primary sealing surface against two relatively movable members and the secondary sealing surface substantially normal thereto.
    Type: Grant
    Filed: November 30, 1977
    Date of Patent: January 2, 1979
    Assignee: Kommanditbolaget United Stirling (Sweden) AB & Co.
    Inventor: Roy S. G. Lagerqvist