Patents by Inventor William Henry Dufft

William Henry Dufft 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: 4013915
    Abstract: A mounting scheme designed to provide enhanced brightness and off-axis viewing of a discrete light emitting device is described. The device is placed within a cavity with reflecting side walls. Situated above the cavity is a contrast filter which has formed therein a plurality of spherical lenses. The lens arrangement is designed to produce an array of discrete images of the device separated by dark areas in order to increase the visibility of the device. The cavity side walls reflect onto the lenses light which would not normally be incident thereon thereby further enhancing visibility and permitting good off-axis viewing.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: March 22, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: William Henry Dufft