Patents by Inventor Martin Heffler

Martin Heffler 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).

  • Filter element retainer construction
    Patent number: 4009012
    Abstract: Improvements in filter banks wherein a framework having plural openings is provided with filter elements in respective openings, holding elements in bearing engagement with marginal regions of the filter elements, and releasable gripping means attached to the holding elements in releasable gripping relation with an adjacent framework portion to removably retain the holding elements in holding position.
    Type: Grant
    Filed: October 20, 1975
    Date of Patent: February 22, 1977
    Inventor: Martin Heffler