Patents by Inventor Mary J. Mathis

Mary J. Mathis 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).

  • Cryogenic liquid nitrogen production system
    Patent number: 5339641
    Abstract: A system for producing liquid nitrogen from a nitrogen-containing hydrocarbon stream wherein excess refrigeration existing in a nitrogen rejection unit or in an integrated nitrogen rejection unit-helium rejection unit system is utilized to effectively generate a liquid nitrogen product stream.
    Type: Grant
    Filed: July 7, 1993
    Date of Patent: August 23, 1994
    Assignee: Praxair Technology, Inc.
    Inventors: Mary J. Mathis, James J. Maloney