Patents by Inventor Reginald Frederick Hansford

Reginald Frederick Hansford 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).

  • Projection apparatus
    Patent number: 4060318
    Abstract: A projector for projecting a movable spot of light onto a screen includes a pair of plates mounted adjacent and parallel to each other, each plate being opaque, apart from a straight slot. The slots cross one another at a crossing point defining an aperture which is transparent to light from a light source. The plates are mounted to be independently movable in such a way that the aperture is selectively displaceable thereby to allow controlled movement of the spot on the screen.
    Type: Grant
    Filed: March 22, 1976
    Date of Patent: November 29, 1977
    Assignee: Decca Limited
    Inventor: Reginald Frederick Hansford