Patents by Inventor Mitchel J. Keil

Mitchel J. Keil 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).

  • Adjustable spring rate pogo stick
    Patent number: 6390956
    Abstract: An adjustable spring rate pogo stick that incorporates two springs, with different spring rates, in parallel. This two-spring system can produce three different spring rates by allowing the user to engage one spring (first setting), the other spring (second setting) or both springs simultaneously (third setting). This pogo stick will accommodate weights of below 80 pounds to above 250 pounds.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: May 21, 2002
    Inventors: Daniel R. Seelye, John Hoss, Jeremy L. Iford, Mitchel J. Keil
  • Multi-channel fiber-optic rotary joint
    Patent number: 6301405
    Abstract: A multi-channel fiber-optic rotary joint having an elongate housing with a passageway extending therethrough. Fiber optic containing bundles are oriented in hollow shafts at the opposite ends of the passageway, which hollow shafts are rotatively supported in the housing. An alignment mechanism is provided inside the housing for effecting an optimizing of signal strength of signals transmitted between the respective fiber optic bundles.
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: October 9, 2001
    Assignee: The Board of Trustees of Western Michigan University
    Inventor: Mitchel J. Keil
  • Shock absorbing battery housing
    Patent number: 4469765
    Abstract: A portable battery device is provided which dampens shock incident upon the battery device such that an electrical energizable apparatus connected to the battery device is subject to reduced shock whenever the battery device receives an impact. The battery device includes a battery housing of resilient shock absorbing material injection molded around an interconnecting structure which mechanically and electrically interconnects the battery housing to an electrically energizable apparatus.
    Type: Grant
    Filed: March 4, 1983
    Date of Patent: September 4, 1984
    Assignee: Motorola, Inc.
    Inventors: William J. McCartney, Jerome D. Jacobs, Mitchel J. Keil