Patents by Inventor Herbert W. Evans

Herbert W. Evans 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).

  • Protective air lock
    Patent number: 3946645
    Abstract: A device suitable for preventing escape and subsequent circulation of toxic gases comprising an enclosure which is sealed by a surrounding air lock, automatic means for partially evacuating said enclosure and said air lock and for ventilating said enclosure and means for disconnecting said enclosure ventilating means, whereby a relatively undisturbed atmosphere is created in said enclosure.
    Type: Grant
    Filed: December 14, 1949
    Date of Patent: March 30, 1976
    Assignee: The United States of America as represented by the United States Energy Research and Development Administration
    Inventor: Herbert W. Evans