Patents by Inventor Ping Ma

Ping Ma 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).

  • Patent number: 5370402
    Abstract: A compliant seal device for sealing a high pressure area from a low pressure area. The compliant seal device comprises a base member including an annular base wall, a first wall extending radially inward from the base wall proximate the high pressure area and a second wall extending radially inward from the base wall proximate the low pressure area, the base member having a cavity formed therein between the first wall and the second wall. The compliant seal device further comprises a plurality of flexible sheet members extending between the first wall and the second wall, each of the plurality of flexible sheet members having a base end fixed to the first wall and a moveable free end in sealing engagement with the second wall to substantially enclose the cavity with an adjustable pressure therein.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: December 6, 1994
    Assignee: EG&G Sealol, Inc.
    Inventors: James F. Gardner, Hai-Ping Ma
  • Patent number: 5144409
    Abstract: A semiconductor structure including a single-crystal region composed of an isotopically enriched semiconductor material, and a semiconductor device formed in the isotopically enriched semiconductor region.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: September 1, 1992
    Assignee: Yale University
    Inventor: Tso-Ping Ma
  • Patent number: 4013485
    Abstract: The electrical properties of MIS semiconductor devices, which have been damaged by radiation, are restored by treating the devices in a properly oriented RF field at low pressure.
    Type: Grant
    Filed: April 29, 1976
    Date of Patent: March 22, 1977
    Assignee: International Business Machines Corporation
    Inventors: Tso-Ping Ma, William Hsioh-Lien Ma