Patents by Inventor Terrance D. Hostetter

Terrance D. Hostetter 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).

  • Emissions test enclosure with minimized air exchange
    Patent number: 5167146
    Abstract: A vehicle emissions test shed is able to accommodate internal pressure changes due to temperature changes or other causes during a test cycle, which would otherwise cause a measurement threatening air exchange. The pressure is kept constant, without changing the shed volume and without withdrawing air and fuel vapor from within the shed. Airtight compensation bladders within the shed are inflated or exhausted in response to a sensed incipient pressure drop or rise. The pressure is automatically kept substantially constant, preventing leaks in or out of the shed.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: December 1, 1992
    Assignee: General Motors Corporation
    Inventor: Terrance D. Hostetter