Patents by Inventor John W. Friend

John W. Friend 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).

  • Dual port valve with stepper motor actuator
    Patent number: 5364066
    Abstract: This refrigeration system expansion valve (10) includes a body (12) having an inlet (20) and an outlet (22) and a valve assembly (24) within the body (12). The valve assembly (24) includes a first port (28) communicating with the inlet (20) and a second, larger port (30) communicating with the outlet (22) and further includes a pin (32) having a first pin portion (34) received by the first port (28) and a second pin portion (36) received by the second port (30). A stepper motor (100) attached to the valve body (12) cooperates with an actuator assembly (60) attached to the pin (32) to induce longitudinal movement into the pin and thereby control refrigerant flow through the valve.
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: November 15, 1994
    Assignee: Sporlan Valve Company
    Inventors: David C. Dorste, Dennis L. Hoehne, John W. Friend, Donald L. Tillotson