Patents by Inventor Arlie Ehlman

Arlie Ehlman 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).

  • Fuse with improved spring timer
    Patent number: 4992770
    Abstract: The dual element time delay fuse includes a circuit overload trigger which opens the fuse in response to long term medium circuit overloads, and a short circuit strip disposed in a solid matrix filler for opening the fuse in response to the presence of a short circuit in the circuit.
    Type: Grant
    Filed: September 11, 1989
    Date of Patent: February 12, 1991
    Assignee: Cooper Industries, Inc.
    Inventors: Keith A. Spalding, Fred Levko, Donald Johnston, John Ackermann, Arlie Ehlman