Patents by Inventor Edward G. Tefft

Edward G. Tefft 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).

  • Fast isolation diffusion
    Patent number: 4325182
    Abstract: A method for forming low stress recesses in bodies of semiconductor material involves damaging the body either thermally or mechanically in the area where the recess is to be formed followed by etching in either a plasma or chemical medium to remove the damaged body portion leaving a relatively stress-free slot or other recess. Such recesses are utilized as diffusion sites for rapid formation of diffusion regions through semiconductor wafers and for the subdivision of wafers into discrete devices.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: April 20, 1982
    Assignee: General Electric Company
    Inventors: Edward G. Tefft, Bernard R. Tuft
  • Glass passivated gold diffused rectifier pellet and method for making
    Patent number: 4148672
    Abstract: Disclosed is a rectifier pellet and a method for the fabrication thereof. A layer of oxide is grown on a semiconductor wafer that has been diffused to form a plurality of rectifier pellets, and openings are etched in the oxide at locations corresponding to each pellet. Gold is diffused through the openings into a preselected distribution to reduce turnoff time. Grooves are etched to facilitate glass passivation and division of the wafer into pellets.
    Type: Grant
    Filed: September 12, 1977
    Date of Patent: April 10, 1979
    Assignee: General Electric Company
    Inventors: Richard W. Kennedy, Edward G. Tefft
  • Selective irradiation of thyristors
    Patent number: 4134778
    Abstract: The dv/dt characteristics of a bidirectional thyristor are improved by irradiating selected portions of the device with high energy crystal lattice-damaging particles. In an exemplary embodiment, the commutating dv/dt of a triac is enhanced by the masked, selective irradiation of the boundaries between conducting portions and between the gate and the conducting portions.
    Type: Grant
    Filed: September 2, 1977
    Date of Patent: January 16, 1979
    Assignee: General Electric Company
    Inventors: William W. Sheng, Y. S. Edmund Sun, Edward G. Tefft
  • Producing glass passivated gold diffused rectifier pellets
    Patent number: 4061510
    Abstract: Disclosed is a rectifier pellet and a method for the fabrication thereof. A layer of oxide is grown on a semiconductor wafer that has been diffused to form a plurality of rectifier pellets, and openings are etched in the oxide at locations corresponding to each pellet. Gold is diffused through the openings into a preselected distribution to reduce turnoff time. Grooves are etched to facilitate glass passivation and division of the wafer into pellets.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: December 6, 1977
    Assignee: General Electric Company
    Inventors: Richard W. Kennedy, Edward G. Tefft
  • Triac with gold diffused boundary
    Patent number: 3943013
    Abstract: Disclosed is a bidirectional triode thyristor pellet that comprises two current conductive regions and a gate region. Gold is diffused into the boundaries between the several regions to inhibit carrier migration thereacross and thus reduce turnoff time. Also disclosed is a method of fabricating the subject thyristor pellet that permits glass passivation thereof if desired.
    Type: Grant
    Filed: October 11, 1973
    Date of Patent: March 9, 1976
    Assignee: General Electric Company
    Inventors: Richard W. Kennedy, Edward G. Tefft
  • Glass passivated gold diffused SCR pellet and method for making
    Patent number: 3941625
    Abstract: Disclosed is an SCR pellet and a method for the fabrication thereof. A layer of oxide is grown on a semiconductor wafer that has been diffused to form a plurality of SCR pellets and openings are etched in the oxide at locations corresponding to each pellet. Gold is diffused through the openings into a preselected distribution in the base region to reduce turnoff time. Grooves are etched to facilitate glass passivation and division of the wafer into pellets.
    Type: Grant
    Filed: October 11, 1973
    Date of Patent: March 2, 1976
    Assignee: General Electric Company
    Inventors: Richard W. Kennedy, Edward G. Tefft