Patents by Inventor Robert E. Knowlton

Robert E. Knowlton 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).

  • Natural gas storage and retrieval system
    Patent number: 4805674
    Abstract: A natural gas storage and retrieval system which comprises natural gas storage means adapted to receive and store natural gas under pressure and a natural gas displacing liquid under pressure; means for feeding natural gas under pressure to said natural gas storage means whereby said stored displacing fluid is displaced; means for feeding said displacing liquid under pressure to said natural gas storage means whereby said stored natural gas is displaced; and means for collecting said displaced natural gas. The system provides a fast fill compressed natural gas station in which the storage inventory is significantly reduced with consequent improvement in environmental safety.
    Type: Grant
    Filed: September 16, 1987
    Date of Patent: February 21, 1989
    Assignee: C-I-L Inc.
    Inventor: Robert E. Knowlton