Patents by Inventor William C. Drach

William C. Drach 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).

  • Open cryogenic microwave test chamber
    Patent number: 5052183
    Abstract: A cryogenic microwave test chamber consists of a dry-sample receiving char which is partly immersed in liquid nitrogen. Waveguides from either end of the interior of the dry chamber are connected to and sealed to outgoing waveguides in regions immersed in the liquid nitrogen. Dry nitrogen is introduced through the waveguide and is circulated through the dry chamber to prevent condensation therein during cooling. A heat conductive metal tube surrounds the dry chamber and is spaced therefrom and acts as a heat barrier. Waveguide flanges on the opposite ends of the dry chamber slidably seal the chamber.
    Type: Grant
    Filed: January 4, 1991
    Date of Patent: October 1, 1991
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Thomas E. Koscica, Richard W. Babbitt, William C. Drach