Patents by Inventor John G. Challenger

John G. Challenger 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).

  • Clean containment room construction
    Patent number: 5316518
    Abstract: A clean containment room construction (2) comprising a work room (4) having a floor (6), walls (8) and a ceiling (10), an isolation void (12) which surrounds the walls (8) and the ceiling (10) of the work room (4), air-circulating apparatus (14) for maintaining a circulation of air in the workroom (4) which is at a positive pressure with respect to atmospheric pressure, and air-circulating apparatus (16) for maintaining air in the isolation void (12) which is at a negative pressure with respect to atmospheric pressure.
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: May 31, 1994
    Assignee: Clean Room Construction (London) Ltd.
    Inventor: John G. Challenger