Patents by Inventor Marc F. Christensen

Marc F. Christensen 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: 4901606
    Abstract: The invention relates to a device for positioning or extracting light bulbs from hard-to-reach places. The device has an extendable handle, and support attached to the handle and the main housing mounted on the support for a limited rotational movement about longitudinal axis of the support. A pair of independently activated electrical motors positioned within the housing operate the device. The first motor transmits a longitudinal movement to a piston having a suction cup for gripping a light bulb, and a second motor transmits rotational movement to the gripped bulb.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: February 20, 1990
    Inventor: Marc F. Christensen