Patents by Inventor Raymond F. Stelzer

Raymond F. Stelzer 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).

  • Pressure protection valve and system
    Patent number: 3993361
    Abstract: A pressure protection valve includes a housing having first and second ends. A passageway is formed in the housing for interconnecting the ends to permit fluid to flow from the first to the second end. Also, the housing includes a first portion of the passageway adjacent the first end and a second portion of the passageway adjacent the second end. A pressure responsive element is provided in the first portion to respond to preselected pressure conditions for permitting and limiting the flow of fluid from the first to the second end. In addition, a check valve is provided in the second portion for permitting the flow of fluid from the first to the second end and for limiting the flow of fluid from the second to the first end.
    Type: Grant
    Filed: September 10, 1975
    Date of Patent: November 23, 1976
    Assignee: Wagner Electric Corporation
    Inventor: Raymond F. Stelzer