Patent 6955702 was granted and assigned to 3M on October, 2005 by the United States Patent and Trademark Office.
A reusable filter frame adapted to receive a replaceable filter element includes a base and a cover connected with the base. The base includes a plurality of longitudinal rails and a plurality of transverse ribs for supporting and spacing the filter element. The filter frame also includes a securing mechanism for securing the filter element to the frame and maintaining the filter element in its expanded condition.