Patents by Inventor James Leonard Berkhoel

James Leonard Berkhoel 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).

  • Patent number: 7344577
    Abstract: A filter tube frame for use with a filter bag house. The filter tube frame includes an end cap having a pivotable handle attached thereto to facilitate removal of the tube frame from the bag house. The handle includes a lever surface adapted to engage a tube sheet surface, thus, during use, providing a force to urge the end cap away from the tube sheet and unseat the filter tube frame from the tube sheet.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: March 18, 2008
    Assignee: Donaldson Company, Inc.
    Inventor: James Leonard Berkhoel
  • Patent number: 5954849
    Abstract: A filter element includes first and second ends, an extension of filter media, an outer liner, an inner liner, and a sealing ring. The first end cap consists essentially of a foamed polyurethane having an as molded density of about 14-22 pounds per cubic foot. The sealing ring extends outwardly only from the outer surface of the first end cap. The sealing ring is a molded part of the first end cap and consists essentially of foamed polyurethane having an as molded density of about 14-22 pounds per cubic foot. The sealing ring has an axially directed top edge, first and second sidewall portions, and a base. The first and second sidewall portions are immediately adjacent to and angled from the top edge of the sealing ring.
    Type: Grant
    Filed: September 30, 1997
    Date of Patent: September 21, 1999
    Assignee: Donaldson Company, Inc.
    Inventors: James Leonard Berkhoel, Michael S. Bergeson, Dolan D. Bartels
  • Patent number: 5803941
    Abstract: The invention is directed toward a filter element for mounting on an air filter system. The filter element has a central air flow aperture and a first slide or support construction. The slide or support construction has a central rim, which is positioned within the central air flow aperture and is oriented to support the filter element.
    Type: Grant
    Filed: October 23, 1995
    Date of Patent: September 8, 1998
    Assignee: Donaldson Company, Inc.
    Inventors: James Leonard Berkhoel, Dolan D. Bartels, Michael S. Bergeson, Bruce A. Johnson, Steven D. Schmeichel