Patents by Inventor Mark D. Crittenden

Mark D. Crittenden 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).

  • Control of the atmosphere in an enclosure
    Patent number: 4485729
    Abstract: A method of controlling an atmosphere in an enclosure (12) to which gas (40) is being supplied comprises the steps of monitoring (53) atmospheric pressure within the enclosure and the rate of gas flow to (52) or from the enclosure, comparing these parameters (62) with adjustable set points to obtain error values and adjusting inflow (50) and exhaust (51) valves for the enclosure in dependence upon the error values. A preferred method includes the intermediate steps of deriving from the error values, target positions for the valves. Also disclosed is an installation incorporating a control system for carrying out the method.
    Type: Grant
    Filed: February 2, 1984
    Date of Patent: December 4, 1984
    Assignee: Commonwealth of Australia
    Inventors: Mark D. Crittenden, Graeme J. Lowe, Neil S. McLaren