Patents by Inventor Jacob Appelbaum

Jacob Appelbaum 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).

  • Proximity printing method
    Patent number: 4026653
    Abstract: A predetermined small spacing or gap between a semiconductor wafer and a mask is defined by projecting a cushion of air through a central mask aperture toward the wafer. The wafer is supported on a sponge rubber member which is designed, along with the air flow paths, to maintain a uniform small separation as is desirable in the photolithographic printing of semiconductor mask patterns.
    Type: Grant
    Filed: May 9, 1975
    Date of Patent: May 31, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Jacob Appelbaum, Martin Feldman