Patents by Inventor Dave Pandres, Jr.

Dave Pandres, Jr. 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: 4156933
    Abstract: A ratio preserving method and apparatus for a system having a plurality of operating values, each independently changeable over a prescribed quantity range by a change in a separate control input by selectively interconnecting the separate control inputs so that change in one of the interconnected control inputs produces an appropriate change in the other interconnected control inputs to maintain the selected fixed ratio between the interconnected operating values. One such system illustrated is a zoom lens where the ratio between object distance and focal length can be selectively fixed to keep the image size constant while the focus is changed when the distance between the object and the lens changes.
    Type: Grant
    Filed: July 28, 1977
    Date of Patent: May 29, 1979
    Inventor: Dave Pandres, Jr.
  • Patent number: 4145732
    Abstract: A ratio preserving control system for a camera zoom lens for selectively interconnecting the object distance (focus) control mechanism and the focal length (zoom) control mechanism to selectively and automatically maintain a selected ratio between the object distance value of the lens and the focal length value of the lens so as to maintain a selected constant image size while the focal length value is changed to keep an object in focus when the distance between the object and the lens is changing or changes.
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: March 20, 1979
    Inventor: Dave Pandres, Jr.