Patents by Inventor James E. Steffen

James E. Steffen 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).

  • Heat exchanger
    Patent number: 4997034
    Abstract: A heat exchanger including a plate of heat conductive material having a first major face and second major face. An array of a plurality of integral heat transfer elements projecting from the first face and a fan to cause a flow of a heat transfer fluid past the heat transfer elements thereby transferring heat between the heat exchanger and the heat transfer fluid.
    Type: Grant
    Filed: December 23, 1987
    Date of Patent: March 5, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: James E. Steffen, Vaughn B. Grannis, Frank S. Schroder
  • Valve cover
    Patent number: D347298
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: May 24, 1994
    Assignee: Minnesota Mining and Manufacturing company
    Inventors: Daniel A. Japuntich, David C. Byram, James E. Steffen