Patents by Inventor Bernard C. De Loach, Jr.

Bernard C. De Loach, 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).

  • Optical system for interrogation of the status of a switch
    Patent number: 4429231
    Abstract: A system (FIG. 1) for interrogating the ON-OFF status of an electrical switch (31) comprises a semiconductor body (4) containing a PN junction and means (5) for electrically connecting an auxiliary switch (32) coupled to the interrogated switch, or alternately (FIG. 2) the interrogated switch (32), across the PN junction. Light (7) of a first wavelength incident on the semiconductor body causes light of a second wavelength (11) to be emitted from the body when the switch is open (OFF), whereas no light is emitted from the body when the switch is closed (ON). Therefore, photoelectric detection of the emission vs. non-emission of light of the second wavelength from the semiconductor body indicates the OFF vs. ON status of the switch.
    Type: Grant
    Filed: November 25, 1981
    Date of Patent: January 31, 1984
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Bernard C. De Loach, Jr., Richard C. Miller, Bertram Schwartz
  • Redundant light source circuit
    Patent number: 4403139
    Abstract: Circuits for selectively operating redundant light sources (lasers or LEDs) in lightwave communication systems are described.
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: September 6, 1983
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventor: Bernard C. De Loach, Jr.