Patents by Inventor Johannes Tetzner

Johannes Tetzner 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).

  • Check value
    Patent number: 4607661
    Abstract: A check valve is provided having a valve casing, at least one pivotable closure element and at least one movable control element connected with an operating rod which cooperates with said closure element. The operating rod extends transversely to the longitudinal axis of the valve casing and motion-translating coupling means are arranged between the operating rod and the closure element.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: August 26, 1986
    Assignee: GESTRA Aktiengesellschaft
    Inventors: Lur Wessels, Johannes Tetzner