Patents by Inventor Charles Michael Harden

Charles Michael Harden 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).

  • Air filter retaining system
    Patent number: 7128771
    Abstract: A filter retaining system formed from multiple filter retaining frames is disclosed. Each of the frames is formed from either a female type extrusion or a combination of male and female type extrusions. Specifically, each frame has either a tongue or a groove which is engageable into a corresponding groove or tongue of an adjacent frame. The tongue and groove engagement provides added rigidity to the retaining system, as well as preventing air from bypassing the filters retained within each frame.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: October 31, 2006
    Assignee: Total Filtration Manufacturing
    Inventor: Charles Michael Harden