Patents by Inventor Donald R. Shaifer

Donald R. Shaifer 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).

  • Gridbeam
    Patent number: 5210988
    Abstract: A modular construction system made up of a plurality of abutting orthogonal grids having a substantial section height and tensioning rods passing between abutting grids. The rods are located at the bottom third of the section height when spanning supports and in the top third when cantilevering grids off of supports.
    Type: Grant
    Filed: March 15, 1991
    Date of Patent: May 18, 1993
    Inventor: Donald R. Shaifer