Patents by Inventor Bernhard G. Ulfers

Bernhard G. Ulfers 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).

  • Programming power paths in an IC by combined depletion and enhancement implants
    Patent number: 4633572
    Abstract: An enhancement implant used in late programming of a ROM in an integrated circuit is combined with a depletion implant used much earlier in the fabrication process to also permit late programming of power paths in the integrated circuit. The implants must be matched and the IC heated after the enhancement implant.
    Type: Grant
    Filed: October 23, 1985
    Date of Patent: January 6, 1987
    Assignee: General Motors Corporation
    Inventors: Randy A. Rusch, Douglas A. Kittle, Bernhard G. Ulfers, Stephen L. Inman