Patents by Inventor Leonard R. Lieblein

Leonard R. Lieblein 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).

  • Exhaust hood with disposable filter assembly and filter-condition sensor
    Patent number: 5211159
    Abstract: The invention of this application comprises a novel filter assembly including a charcoal filter and a fiberglass filter positioned within a housing. The fiberglass filter comprises a fiberglass mat mounted to a wire structure formed in an accordion-shape so as to increase the surface area of the fiberglass mat. The invention also comprises a novel sensor system for sensing when the grease filter and the filter assembly have been installed, for sensing when the filter assembly is about to require changing and for shutting down the exhaust hood when the assembly requires changing.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: May 18, 1993
    Assignee: Standex International Corporation
    Inventors: Leonard R. Lieblein, Raymond W. Rogers, William F. Harnesberger
  • Filter hood
    Patent number: D349158
    Type: Grant
    Filed: March 19, 1992
    Date of Patent: July 26, 1994
    Assignee: Standex International Corporation
    Inventor: Leonard R. Lieblein
  • Oven
    Patent number: D384544
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: October 7, 1997
    Assignee: Standex International Corporation
    Inventors: Leonard R. Lieblein, Michael G. Walpole, Barry L. Bergstein