Patents by Inventor Bryant Welch

Bryant Welch 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).

  • Qualification test of gallium arsenide
    Patent number: 4157497
    Abstract: Semi-insulating GaAs material is qualified for ion implantation by taking a sample or samples from the material to be evaluated, polishing a surface of the sample, and chemically etching the surface to remove mechanical damage. The surface is bombarded with ions of an inert gas such as krypton, helium, argon, neon, or xenon. After bombardment, the sample is annealed and the sheet resistance is measured to determine if it meets a predetermined acceptable value.
    Type: Grant
    Filed: January 5, 1978
    Date of Patent: June 5, 1979
    Assignee: Rockwell International Corporation
    Inventors: Fred H. Eisen, Ricardo Zucca, Bryant Welch