Patents by Inventor David Andrew Diggins

David Andrew Diggins 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).

  • System and method for compressing natural gas and for refueling motor vehicles
    Patent number: 5694985
    Abstract: A system and method for selectively refueling a plurality of vehicle storage tanks with compressed natural gas (CNG) are provided that utilize a compressor system operable at suction pressures ranging from about 330 to about 3600 psig and discharge pressures ranging from about 330 to about 4500 psig in combination with means for temporarily storing CNG at an intermediate storage pressure of from about 330 to about 4500 psig, preferably from about 1700 to about 2700 psig, means for selectively filling vehicle storage tanks with CNG from an inlet source, from the compressor discharge and from the intermediate storage tanks, and means for selectively supplying CNG to the compressor inlet at either the available line pressure or the intermediate storage pressure.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: December 9, 1997
    Assignee: Pinnacle CNG Systems, LLC
    Inventor: David Andrew Diggins