Patents by Inventor Donald Mammato

Donald Mammato 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).

  • Image reversal negative working photoresist containing O-quinone diazide and cross-linking compound
    Patent number: 5399456
    Abstract: A process for converting a normally positive working photosensitive composition to a negative working composition. One forms a composition containing an alkali soluble resin, a 1,2 quinone diazide-4-sulfonyl compound and an acid catalyzed crosslinker in a solvent mixture. After drying and imagewise exposing, the composition is baked and developed to produce a negative image.
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: March 21, 1995
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark A. Spak, Donald Mammato, Dana Durham, Sangya Jain
  • Image reversal negative working O-naphthoquinone diazide and cross-linking compound containing photoresist process with thermal curing
    Patent number: 5256522
    Abstract: A process for converting a normally positive working photosensitive composition to a negative working composition is disclosed. One forms a composition containing an alkali soluble resin, a 1,2 quinone diazide-4-sulfonyl compound and an acid catalyzed crosslinker in a solvent mixture. After drying and imagewise exposing, the composition is baked and developed to produce a negative image. The image-reversal negative-working photoresists of this invention have superior storage stability and shelf life.
    Type: Grant
    Filed: December 30, 1991
    Date of Patent: October 26, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark A. Spak, Donald Mammato, Dana Durham, Sangya Jain
  • Image reversal negative working o-quinone diazide and cross-linking compound containing photoresist process with thermal curing treatment and element produced therefrom
    Patent number: 5217840
    Abstract: A process for converting a normally positive working photosensitive composition to a negative working composition. One forms a composition containing an alkali soluble resin, a 1,2 quinone diazide-4-sulfonyl compound and an acid catalyzed crosslinker in a solvent mixture. After drying and imagewise exposing, the composition is baked and developed to produce a negative image.
    Type: Grant
    Filed: May 25, 1990
    Date of Patent: June 8, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark A. Spak, Donald Mammato, Dana Durham, Sangya Jain
  • Image reversal negative working O-quinone diazide and cross-linking compound containing photoresist process with thermal curing treatment
    Patent number: 4931381
    Abstract: A process for converting a normally positive working photosensitive composition to a negative working composition. One forms a composition containing an alkali soluble resin, a 1,2 quinone diazide-4-sulfonyl compound and an acid catalyzed crosslinker in a solvent mixture. After drying and imagewise exposing, the composition is baked and developed to produce a negative image.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: June 5, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark A. Spak, Donald Mammato, Dana Durham, Sangya Jain
  • Image reversal negative working O-napthoquinone diazide and cross-linking compound containing photoresist process with thermal curing
    Patent number: 4929536
    Abstract: A process for converting a normally positive working photosensitive composition to a negative working composition is disclosed. One forms a composition containing an alkali soluble resin, a 1,2 quinone diazide-4-sulfonyl compound and an acid catalyzed crosslinker in a solvent mixture. After drying and imagewise exposing, the composition is baked and developed to produce a negative image. The image-reversal negative-working photoresists of this invention have superior storage stability and shelf life.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: May 29, 1990
    Assignee: Hoechst Celanese Corporation
    Inventors: Mark A. Spak, Donald Mammato, Dana Durham, Sangya Jain