Patents by Inventor Donald M. Hansen

Donald M. Hansen 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).

  • Filtering means for arc suppressing gas system
    Patent number: 4259097
    Abstract: Arc suppressing gas in a high voltage circuit breaker system is collected, filtered and compressed. The compressed gas is passed through a series of oil and desiccant filters and returned to a high pressure vessel for storage. The oil and desiccant filtering system is combined in a single, separable casing including baffles and a check valve.
    Type: Grant
    Filed: December 26, 1979
    Date of Patent: March 31, 1981
    Assignee: Siemens-Allis, Inc.
    Inventors: Amrut R. Patel, Donald M. Hansen
  • Force convection heat pump and temperature measuring system for a gas insulated two pressure breaker
    Patent number: 4208556
    Abstract: A heating system within a high pressure gas enclosure which includes a heat emission block surrounded by an insulating tube to form a forced flow convection pump; temperature probes within the high pressure gas enclosure are located so that they will not be influenced by the operation of the heaters.
    Type: Grant
    Filed: August 22, 1977
    Date of Patent: June 17, 1980
    Assignee: Siemens-Allis, Inc.
    Inventors: Amrut R. Patel, Donald M. Hansen