Patents by Inventor Ben B. Hultsman

Ben B. Hultsman 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).

  • Patent number: 4237969
    Abstract: A novel heat transfer element which permits simple, low-cost conversion of energy inefficient electrically heated water heaters to energy efficient potable-water storage tanks for storing water heated by energy-efficient gas-fired water heating systems.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: December 9, 1980
    Assignee: Southern California Gas Company
    Inventors: Willard E. Andre, Andrew Clausen, Jr., Ben B. Hultsman