Patents by Inventor Garfield Simms

Garfield Simms 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).

  • Bi-directional, feed through emitter-detector for optical fiber transmission lines
    Patent number: 4989051
    Abstract: A unitary emitter-detector diode device for direct optical coupling to optical transmission lines as two surface oriental optical fibers on lateral surfaces of the device. The device has a p-n junction formed between a heavily doped semiconducting layer and a lightly doped semiconducting layer and means for guiding and concentrating the recombination of carriers within the diode. The feed through geometry permits transmitting in either direction from the device as well as detecting.
    Type: Grant
    Filed: February 13, 1990
    Date of Patent: January 29, 1991
    Assignees: The Univ. of Delaware, E. I. DuPont de Nemours & Co.
    Inventors: Thomas W. Whitehead, Robert G. Hunsperger, Garfield Simms
  • Dual mode light emitting diode/detector diode for optical fiber transmission lines
    Patent number: 4948960
    Abstract: This invention relates to a double heterostructure diode and photodiode which is selectively switchable between an emission mode and receiving mode. A light emitting active region is localized and restricted by limitation of the area of contact to a window in a silicon dioxide layer and an optical fiber is coupled to the diode at a lateral surface to provide substantially greater light emission from the lateral surface than from side emission.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: August 14, 1990
    Assignee: The University of Delaware
    Inventors: Garfield Simms, Robert G. Hunsperger