Patents by Inventor Donald Vanderschaaf

Donald Vanderschaaf 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).

  • Environmental test chamber
    Patent number: 4572283
    Abstract: A test chamber device comprising a generally enclosed chamber, a first duct communicating with the chamber and including therein selectively operable heating coils, a second duct communicating with the chamber and including therein selectively operable refrigerating coils, and a damper for closing the second duct when the heating coils are operating so that the refrigerating coils are isolated from air flow in the chamber.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: February 25, 1986
    Assignee: Wehr Corporation
    Inventor: Donald Vanderschaaf