Patents by Inventor Mitchell D. Feather

Mitchell D. Feather 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).

  • Patent number: 4623257
    Abstract: A high-precision alignment pattern for fine-line device fabrication comprises unique marks. The pattern is utilized to align a mask or reticle with respect to a wafer and/or to evaluate actual level-to-level registration achieved between a set of masks or reticles and a wafer. One mark of the pattern comprises two spaced-apart parallel lines. The other mark comprises a notch or arrow-head including an apex portion. In practice, the orientation between the apex portion and the associated parallel lines of the pattern can be read relatively easily with high accuracy.
    Type: Grant
    Filed: December 28, 1984
    Date of Patent: November 18, 1986
    Assignee: AT&T Bell Laboratories
    Inventor: Mitchell D. Feather