Patents by Inventor Lloyd E. Clarke

Lloyd E. Clarke 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).

  • Portable drawing apparatus
    Patent number: 4224742
    Abstract: A drafting set, including a drawing board and a T-square, the board having a foldable easel on its rear side for supporting the board in various adjustable positions, the T-square including a slidable shoe on its outward end for bearing against an edge of the board which is opposite an edge against which the T-square crosshead bears, and permanent magnet means holding the shoe and crosshead from falling away from the board edges.
    Type: Grant
    Filed: June 8, 1979
    Date of Patent: September 30, 1980
    Inventor: Lloyd E. Clarke