Patents Examined by Melvin D. Rein
  • Display device for varying the shape and cross-section of a rectangular area
    Patent number: 3934364
    Abstract: A display device having a rectangular area of variable shape and cross-section with a pair of movable line markers defining the horizontal boundaries and another pair of movable line markers defining the vertical boundaries, means for moving each pair of line markers to vary the distance therebetween to obtain the rectangular area of desired shape and cross-section. Simultaneous movement and regulated separation of pairs of line markers may be obtained by rotating elliptical cams connected to the line markers.
    Type: Grant
    Filed: November 12, 1973
    Date of Patent: January 27, 1976
    Assignee: Electroacustic GmbH
    Inventor: Hans-Robert Kuhn