Patents by Inventor Roger A. Hoffman

Roger A. Hoffman 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: 5529539
    Abstract: Materials and arrangements in development for a special swing.A pair of pyramid style support posts anchored at its prospective plane by means of concrete or plates, said support post secures a horizontal support bar at their tops. The horizontal support bar has its length and the width of the support post, and in its center, two block or sleeve bearings being attached to a pair of upright vertical solid bars spaced in width as that of the seat, in length to that of the height of the swing, incorporating a seat at their prospective lower ends, being threaded to secure the seat and safety straps, and the unique feature is a pair of double-swivel eyes interlocked, with adjustable stops on each upright bar the distance above the seat at hip level.
    Type: Grant
    Filed: September 2, 1993
    Date of Patent: June 25, 1996
    Inventor: Roger A. Hoffman