Patents by Inventor Douglas N. Sweet

Douglas N. Sweet 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).

  • Pressure regulator
    Patent number: 4936340
    Abstract: A pressure control assembly is disclosed. The assembly includes a pressure transducer for detecting upstream pressure. A diaphragm is used to regulate flow through the assembly, and is forced into a closed position by pressure from a fluid column. The pressure on the fluid column is controlled by a piston driven by a step motor. The step motor is activated in response to signals from the pressure transducer.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: June 26, 1990
    Assignee: Coretest Systems, Inc.
    Inventors: Jared M. Potter, Douglas N. Sweet