Patents by Inventor Robert A. Lancaster

Robert A. Lancaster 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).

  • Preparation of silicon doped mercury cadmium telluride
    Patent number: 4105472
    Abstract: Mercury cadmium telluride is described having a quantity of a silicon dispersed therein in an amount to measurably increase the donor concentration of the mercury cadmium telluride. Silicon has been found to substitute for metal, either mercury or cadmium, in the mercury cadmium telluride crystal. Doping of a region of mercury cadmium telluride with silicon can produce a PN junction when the adjacent region is P-type, and an N-N+ type junction when the adjacent region is N-type.
    Type: Grant
    Filed: February 6, 1978
    Date of Patent: August 8, 1978
    Assignee: Honeywell, Inc.
    Inventor: Robert A. Lancaster
  • Silicon as donor dopant in Hg.sub.1-x Cd.sub.x Te
    Patent number: 4087293
    Abstract: Mercury cadmium telluride is described having a quantity of a silicon dispersed therein in an amount to measurably increase the donor concentration of the mercury cadmium telluride. Silicon has been found to substitute for metal, either mercury or cadmium, in the mercury cadmium telluride crystal. Doping of a region of mercury cadmium telluride with silicon can produce a PN junction when the adjacent region is P-type, and an N-N+ type junction when the adjacent region is N-type.
    Type: Grant
    Filed: January 6, 1977
    Date of Patent: May 2, 1978
    Assignee: Honeywell Inc.
    Inventor: Robert A. Lancaster
  • Protection circuit for telephone switching system
    Patent number: 3996426
    Abstract: An open switching interval protection circuit for maintaining continuity on a telephone line during the switching interval of the central office equipment, in which an auxiliary battery voltage is bridged directly across the telephone line under timed control. With such an arrangement the need to break into the talking path or to tie up additional control circuitry in the central office is avoided, thereby providing high reliability at reasonable cost.
    Type: Grant
    Filed: February 23, 1976
    Date of Patent: December 7, 1976
    Assignee: Northern Electric Company Limited
    Inventor: Robert Lancaster