Patents by Inventor Edd Dems

Edd Dems 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: 4042920
    Abstract: A multiplexed electrical control circuit is provided for use with optical display devices of the type wherein electrical intelligence is translated into optical images of letters or numbers or other patterns through the use of a liquid crystal shutter device fully described in a copending application Ser. No. 136,441, filed Apr. 22, 1971. The shutter device comprises a layer of liquid crystal material sandwiched between opposing parallel plates coated with transparent conducting films. The shutter device, or liquid crystal cell, is disposed between a pair of polarizers such that the application of electrical potential across a character, digit, or other image-defining segment and an opposing position-designating film will cause light to be transmitted or to be cut off, depending upon the orientation of the two polarizers.
    Type: Grant
    Filed: August 12, 1976
    Date of Patent: August 16, 1977
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Thomas B. Harsch, Edd Dems