Patents Represented by Attorney Donald N. Timble

Find this attorney in the Justia Lawyer Directory

  • Gas flow controller
    Patent number: 4437489
    Abstract: A flow controller having a volume, a pressure transducer coupled to said volume, a first valve coupled between a source of gas under pressure and said volume, a second valve coupled between said volume and a reference volume, a third valve coupled between said reference volume and a load wherein said valves are cyclically operated so as to permit gas to flow through said volumes to a load and wherein maximum and minimum pressures are measured with said first and second valves closed.
    Type: Grant
    Filed: December 24, 1981
    Date of Patent: March 20, 1984
    Assignee: Hewlett-Packard Company
    Inventor: Michael A. Casale