Patents by Inventor Roy A. Fetterman, Jr.

Roy A. Fetterman, 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).

  • Pressure equalizing check valve
    Patent number: 6543474
    Abstract: A flapper-type anti-siphoning check valve for a domestic water system has an auxiliary valve built into the flapper. The auxiliary valve permits slow reverse flow of water through the check valve when the flapper is closed to prevent build-up of pressure in the user's water system, but closes as a result of more rapid reverse flow of water in the event of a sudden drop in supply pressure.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: April 8, 2003
    Inventor: Roy A. Fetterman, Jr.