Patents by Inventor Granville Hahn

Granville Hahn 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).

  • Method for retarding mineral buildup in downhole pumps
    Patent number: 4990233
    Abstract: A method for retarding non-corrosive mineral build-up and plugging in check valves utilized with downhole reciprocating rod pumps, comprising ion implanting or ion plating the interior facing metal surfaces of the check valve with a nonferrous metal or metal oxide.
    Type: Grant
    Filed: June 14, 1985
    Date of Patent: February 5, 1991
    Assignee: Permian Research Corporation
    Inventor: Granville Hahn