Patents by Inventor Keith R. Allen

Keith R. Allen 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).

  • Air conditioning unit
    Patent number: D310409
    Type: Grant
    Filed: October 15, 1987
    Date of Patent: September 4, 1990
    Assignee: Sigma Air Conditioning Pty, Limited
    Inventors: Keith R. Allen, Jeffrey Crawford, Geoffrey Rule