Patents by Inventor David R. Holt

David R. Holt 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).

  • Patent number: 4695142
    Abstract: This invention is directed to an automatic photo imagery system wherein there is provide a multiple image single film sheet capability that employs a single degree of freedom, remotely controlled, moveable lens/shutter projection unit in combination with a film sheet transport apparatus that delivers single film sheets in a continuous manner past a projection unit while the projection unit moves in an incremental fashion back and forth across a film sheet path along which the single film sheets move.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: September 22, 1987
    Assignee: Harold A. Williamson
    Inventor: David R. Holt
  • Patent number: 4651998
    Abstract: The invention relates to a projectile target game of the dart type which has individual player score keeping apparatus that includes a pair of nonrotatable shafts around which are loosely carried continuous belts which have an opaque background through which transparent numbers have been formed. Each digit of a number has a width substantially greater than the digits height. The continuous belt passes between a light source and a unidirectional magnifying lens which magnifies only the height dimension of the number's digits. The continuous belt is provided with score advance openings that are exposed via a slot in the face of the game that supports the target. The score advance openings are adjacent the transparent numbers such that a score may be made to appear in the magnifying lens. The target of the dart game is a dart board which has a unique bullseye target deflection detection mechanism.
    Type: Grant
    Filed: June 19, 1985
    Date of Patent: March 24, 1987
    Inventors: David R. Holt, Thomas C. Harms, Jr., Robert B. Shepherd