Patents by Inventor Keith S. Marble

Keith S. Marble 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 sealing the edge of a filter medium to a filter assembly and the filter assembly produced thereby
    Patent number: 5512172
    Abstract: Improved filter assemblies are provided having a pleated filter medium attached to a support frame utilizing an improved manufacturing method employing a welding process to seal the pleated edges of the filter medium to an inwardly protruding sealing means provided on the frame around the inside perimeter thereof, forming a final filter assembly exhibiting an essentially leak-proof edge seal.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: April 30, 1996
    Assignee: Racal Filter Technologies, Ltd.
    Inventor: Keith S. Marble