Granted Patent
Utility
US 4,657,839 · App. 06/526,455
Photoprinting process and apparatus for exposing paste-consistency photopolymers
Inventor:
Donald F. Sullivan
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Aug 25, 1983
Inventor
Donald F. Sullivan
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.