Patents by Inventor Mary K. Witzel

Mary K. Witzel 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).

  • Vapor recovery method and apparatus
    Patent number: 4480393
    Abstract: Vapor recovery system comprising vapor source, vapor concentrating system and refrigeration condensation system. Method comprises accumulating condensable vapor in vapor accumulator, and subsequently removing vapor from accumulator using carrier gas to provide concentrated carrier gas stream. Vapor in carrier gas is condensed by refrigeration condensation means.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: November 6, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Leslie R. Flink, Bryce J. Fox, Mary K. Witzel