Patents by Inventor Hung M. Do

Hung M. Do 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).

  • Adjustable differential pressure valve
    Patent number: 5271428
    Abstract: An adjustable differential pressure valve that controls the pressure of a input fluid by maintaining a pressure differential between the fluid and another fluid, or fluids, of reference pressure, acts as a bypass valve and allows the pressure differential to be adjusted from the outside of the valve either mechanically or by remote hydraulic pressure. In an alternative embodiment of the invention, opposite ends of extensions of the piston are exposed to the outlet pressure of the valve by a passage communicating directly through the extensions and the piston.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: December 21, 1993
    Assignee: Dresser-Rand Company
    Inventors: Charles S. Dunn, Hung M. Do
  • Adjustable differential pressure valve
    Patent number: 5193575
    Abstract: An adjustable differential pressure valve that controls the pressure of a input fluid by maintaining a pressure differential between the fluid and another fluid, or fluids, of reference pressure, acts as a bypass valve and allows the pressure differential to be adjusted from the outside of the valve either mechanically or by remote hydraulic pressure.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: March 16, 1993
    Assignee: Dresser-Rand
    Inventor: Hung M. Do