Patents by Inventor Jian-Dong Shao

Jian-Dong Shao 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).

  • Double acting pump
    Patent number: 5076769
    Abstract: An improved double acting piston pump of the type having a shaft connected to the piston for reciprocating the piston wherein the shaft extends from the pump body. The improvement of the present invention is to reciprocate the shaft with an asymmetrical uniform motion rotary cam so that the pump delivers the same constant flow rate of a liquid being pumped during both the forward and the backward movements of the pump's piston.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: December 31, 1991
    Assignee: The Dow Chemical Company
    Inventor: Jian-Dong Shao