Granted Patent
Utility
US 4,299,906 · App. 06/154,737
Light-sensitive color proofing film with surfactant in a light-sensitive coating
Inventor:
Shuchen Liu
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: May 30, 1980
Inventor
Shuchen Liu
Assignee (at issue)
American Hoechst Corporation
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.