Patents by Inventor Paul R. Varney

Paul R. Varney 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).

  • Heat recovery system
    Patent number: 4502529
    Abstract: A system for transferring heat from outgoing domestic waste liquids to incoming water, including a helical tube forming a wall of the system and carrying the incoming water.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: March 5, 1985
    Inventor: Paul R. Varney