Patents by Inventor Bruce R. Dendulk

Bruce R. Dendulk 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).

  • Progressive resistance lifting mechanism for a window covering
    Patent number: 7331370
    Abstract: A lifting mechanism is provided for a window covering which allows a bottom rail of the window covering to maintain a static position unless raised or lowered by a user. The lifting mechanism is included within either a top or bottom rail of the window covering. The lifting mechanism includes cords which pass from a rail including the lifting mechanism to a rail not including the lifting mechanism and about cord redirectors located within the rail including the lifting mechanism. The lifting mechanism includes spools and associated springs for gathering excess portions of the cord thereon. A progressive resister is coupled to the spools with the progressive resister providing different amounts of resistance to spool rotation depending on the amount of cord upon each spool.
    Type: Grant
    Filed: August 3, 2004
    Date of Patent: February 19, 2008
    Assignee: Shades Unlimited, Inc.
    Inventors: David R. Militello, Barry L. Shevick, Robert L. Lathrop, III, Bruce R. Dendulk