Patents by Inventor Robert W. Hoff

Robert W. Hoff 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).

  • Chemical recovery filter
    Patent number: 4202771
    Abstract: A chemical recovery filter including a new and improved structure which allows rapid and efficient replacement of filter canisters. The structure incorporates snap-connector fittings and a by-pass safety feature in the event of plugging within the system.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: May 13, 1980
    Inventor: Robert W. Hoff