Patents by Inventor Jack L. Sorkin

Jack L. Sorkin 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).

  • Lithographic plate and photoresist having photosensitive layers of diazo and cinnamoylated phenol-blocked isocyanate polyurethane materials
    Patent number: 4486526
    Abstract: A photopolymerizable coating over a diazo resin provides a high-speed lithographic plate or photoresist while improving the printing life of the plate while making its development simpler than that of most other photopolymer plates. The photopolymer is a cinnamoylated resin which is placed over a diazo based material.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: December 4, 1984
    Assignee: Richardson Graphics Company
    Inventors: Daniel C. Thomas, Jack L. Sorkin
  • Lithographic plate and photoresist having photosensitive layers of diazo and cinnamoylated polyvinyl alcohol materials
    Patent number: 4330611
    Abstract: A photopolymerizable coating over a diazo resin provides a high-speed lithographic plate or photoresist while improving the printing life of the plate while making its development simpler than that of most other photopolymer plates. The photopolymer is a cinnamoylated polyvinyl alcohol resin which is placed over a diazo based material.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: May 18, 1982
    Assignee: Richardson Graphics Company
    Inventors: Daniel C. Thomas, Jack L. Sorkin
  • Lithographic plate and photoresist having photosensitive layers of diazo and cinnamoylated polyvinyl alcohol materials
    Patent number: 4133685
    Abstract: A photopolymerizable coating over a diazo resin provides a high-speed lithographic plate or photoresist while improving the printing life of the plate while making its development simpler than that of most other photopolymer plates. The photopolymer is a cinnamoylated polyvinyl alcohol resin which is placed over a diazo based material.
    Type: Grant
    Filed: January 17, 1978
    Date of Patent: January 9, 1979
    Assignee: Richardson Chemical Company
    Inventors: Daniel C. Thomas, Jack L. Sorkin