Patents by Inventor Walter T. Sandin

Walter T. Sandin 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).

  • Optical surveillance assembly and camera
    Patent number: 4963962
    Abstract: A covert surveillance camera assembly comprises a dummy sprinkler head for camouflaging a camera. The sprinkler head has a pair of parallel arms and a mirror is mounted in a predetermined position relative to the camera and between the arms of the sprinkler head. An associated mechanism for scanning an object area may include a rotating component for turning the mirror at a predetermined angular speed in a first direction about an optical axis of the optical device. A dovetail prism is provided for stabilizing an image transmitted from an outlet end of the surveillance assembly, the prism being rotated at one half the angular speed of the rotating mirror in a second direction about the optical device's axis opposite to the first direction.
    Type: Grant
    Filed: January 25, 1989
    Date of Patent: October 16, 1990
    Assignee: Visual Methods, Inc.
    Inventors: Herman A. Kruegle, Walter T. Sandin
  • Compact unit for optical security system
    Patent number: 3997723
    Abstract: A thin wall-mountable unit is disclosed which produces a composite image from a card-like object placed in a slot and a person standing adjacent thereto. The unit includes a pair of lenses for focusing images of the objects on intersecting focal planes. A mirror is mounted in the unit at the intersection of the focal planes. A T.V. camera is employed to sense the composite image resulting therefrom.
    Type: Grant
    Filed: August 19, 1974
    Date of Patent: December 14, 1976
    Assignee: Visual Methods, Inc.
    Inventor: Walter T. Sandin