Patents by Inventor Walter E. Kauffmann

Walter E. Kauffmann 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).

  • Hot water booster
    Patent number: 4090474
    Abstract: A water heating system comprising an exhaust gas water preheating coil supplying water via a storage tank to a water heating boiler.
    Type: Grant
    Filed: June 4, 1976
    Date of Patent: May 23, 1978
    Inventor: Walter E. Kauffmann