Patents by Inventor Jonas St. Alban

Jonas St. Alban 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).

  • Positive photoresist processing with mid U-V range exposure
    Patent number: 4596763
    Abstract: The invention provides a method for producing a positive working photoresist which comprises coating at least one novolak resin, and 1-naphthalenesulfonic acid, 3-diazo-3,4-dihydro-4-oxo-,4-benzoyl-1,2,3-benzenetriyl ester onto a substrate, exposing to a u.v. light source having a wavelength of less than 380 nanometers and developing with an aqueous alkaline solution.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: June 24, 1986
    Assignee: American Hoechst Corporation
    Inventors: John DiCarlo, Jonas St. Alban, Donald C. Mammato, Bruce M. Stevens