Patents by Inventor Shahin Tabanfar

Shahin Tabanfar 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).

  • Automatic test system for check valve closure in pump for liquid chromatography system
    Patent number: 4832575
    Abstract: There is disclosed herein a pump check valve test system embodied in a pump control system which control pump speed based upon actual pressure and upon actual pump speed and desired flow rate. The check valve test system disables the portion of the control system which controls pump speed based upon desired flow rate during the test. The test is comprised of timing the time it takes the pump to rotate through the portion of each cycle wherein the check valve is supposed to close and comparing this time to a known value.
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: May 23, 1989
    Assignee: Spectra Physics
    Inventors: Les A. Miller, Shahin Tabanfar, Chih-Hua Chung