Patents by Inventor Oscar D. Parman

Oscar D. Parman 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).

  • Flapper check valve assembly
    Patent number: 4565214
    Abstract: Integrated flapper check valve assembly consisting of cylindrical flapper check valve housing with valve seats and air passage ports, cylindrical flapper check backer with air passage ports, and intermediate flapper check valve with flat multi-leaf design.
    Type: Grant
    Filed: June 4, 1984
    Date of Patent: January 21, 1986
    Assignee: Dover Corporation
    Inventor: Oscar D. Parman