Patents by Inventor Susan Fahrenholtz

Susan Fahrenholtz 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).

  • Novolak photoresist composition and preparation thereof
    Patent number: 4173470
    Abstract: A novolak resin suitable for use as a light-sensitive photoresist or maskant is prepared by reaction of at least one cresol with an aldehyde or reactive ketone and an aromatic hydroxyl compound having an alkyl side chain of from 3-15 carbon atoms. The addition of a conventional photosensitive agent yields a composition evidencing superior characteristics as compared with prior art novolak photoresists and which requires less sensitizer than such prior art resists.
    Type: Grant
    Filed: November 9, 1977
    Date of Patent: November 6, 1979
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Susan Fahrenholtz, David T. Long, Raymond C. Pitetti