Patents by Inventor Warren L. Ziegler

Warren L. Ziegler 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).

  • Trimodal piston driven sash operator
    Patent number: 4774878
    Abstract: What is disclosed is a new and novel fume hood sash operator system and a fume hood containing such a system. The sash operator is constructed to operate from a pressure fluid cylinder so that the sash member can be stopped, started, moved up or down to accommodate changes in the flow of air moving through the hood structure and to provide a safe, durable, energy savings sash operating system.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: October 4, 1988
    Assignee: Tri City Laboratory Specialists, Inc.
    Inventors: Robert M. Berlin, Richard L. Wendt, Warren L. Ziegler