Patents by Inventor Wilhelm U. Hartmann

Wilhelm U. Hartmann 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 disc
    Patent number: 4637877
    Abstract: A disc-shaped stainless steel filter element including filter media formed from air-laid randomly disposed sintered fibers secured to a hub. The filter media includes opposed sheets of the fibers having perforated plate means therebetween to allow flow from the outside in. The plate means and the fiber sheets are welded together at the outer periphery thereof and the fiber sheets are welded at their inner periphery to the hub.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: January 20, 1987
    Assignee: HR Textron Inc.
    Inventors: Wilhelm U. Hartmann, James A. Martin
  • Filter element having removable filter media member
    Patent number: 4218324
    Abstract: A metallic filter element constructed of stainless steel. The filter element includes a tubular metal support member having a tubular filter media member slipped over the support member. When the filter element becomes clogged and is ready for cleaning or becomes damaged and is ready for replacement, the filter media member may be easily removed by merely slipping it off the tubular metal support member and replacing it with a new or cleaned filter media member.
    Type: Grant
    Filed: May 3, 1979
    Date of Patent: August 19, 1980
    Assignee: Textron, Inc.
    Inventors: Wilhelm U. Hartmann, Larry C. Augustine, Daniel J. Ryan