Patents by Inventor Calford E. Robinson

Calford E. Robinson 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).

  • Hanging file frame
    Patent number: 5568874
    Abstract: A horizontal file rack is composed of two longitudinal horizontal members and two end members of the shape of a U. The end members each have two standards which define loops which allow slantwise insertion of a horizontal member but which make a fixed connection when a horizontal member and a standard are mutually perpendicular.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: October 29, 1996
    Inventor: Calford E. Robinson
  • Horizontal file rack
    Patent number: 5071014
    Abstract: A frame for supporting hanging files comprising two front and two rear standards with hanger rails joining the tops of the standards on each side. Each of the two front and the two rear standards is joined to its front or rear counterpart with horizontal members that partially interlock to form a complete suspension frame.
    Type: Grant
    Filed: October 10, 1990
    Date of Patent: December 10, 1991
    Inventor: Calford E. Robinson