Patents by Inventor Thomas Norvin Ferwerda

Thomas Norvin Ferwerda 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: 3992832
    Abstract: Stairway safety suspension support means that includes overhead means and extending along the stairway above the flight of stairs, from which are suspended successively a plurality of depending loops of flexible strand means with the bottoms of the loops located above the steps less than the heights of people, and also means which dictate that the planes of those loops are oriented generally longitudinally along the stairway.
    Type: Grant
    Filed: May 13, 1976
    Date of Patent: November 23, 1976
    Inventor: Thomas Norvin Ferwerda
  • Patent number: T964001
    Abstract: structural integrated assembly of relatively rigid tubular members that are formed of compositions selected from a group of metallic and plastic materials that are of the desired rigidity. The assembly includes at least a section of such relatively rigid tubular composition which is of relatively large internal cross-sectional dimensions, and at least one other relatively rigid tubular section which is in the form of a transversely smaller bridging member that extends transversely through openings in opposite sides of the relatively large tubular member there to provide two separate and spaced junctions. Suitable means integratively connect all circumambient points of the exterior surface of the smaller bridging member in each junction to all of the immediately adjacent points of the circumscribing edge of the opening in the larger tubular member thereat.
    Type: Grant
    Filed: January 28, 1977
    Date of Patent: November 1, 1977
    Inventor: Thomas Norvin Ferwerda