Patents by Inventor Pierre-Francois Ducommun

Pierre-Francois Ducommun 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).

  • Camera
    Patent number: 4299457
    Abstract: The distance or range setting of a camera lens is most accurate if the focal length and thus the image scale are as large as possible. It is therefore most favorable, if it is desired to effect an accurate distance setting, first of all by a mechanism to move the objective lens to the longest focal length, then to effect the distance setting and only then to move to the desired focal length. A storage or memory device stores the original focal length.
    Type: Grant
    Filed: October 13, 1979
    Date of Patent: November 10, 1981
    Assignee: Bolex International SA
    Inventor: Pierre-Francois Ducommun