Patents by Inventor Ferdinand Roehlich

Ferdinand Roehlich 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).

  • Fire-suppressing foam level controller
    Patent number: 4169278
    Abstract: An electric circuit for energizing a fire-suppressing foam generator includes a switch that is opened and closed by means operated by electric control circuits, one of which contains a pair of laterally spaced lower electric probe contacts mounted in the protected area and adapted to be bridged by a rising level of foam to close that circuit. The other control circuit contains a pair of laterally spaced upper electric probe contacts above the level of the lower contacts and adapted to be bridged by a rising level of foam to close the last-mentioned control circuit.
    Type: Grant
    Filed: March 6, 1978
    Date of Patent: September 25, 1979
    Assignee: Mine Safety Appliances Company
    Inventors: Ferdinand Roehlich, Robert L. Rankin