Granted Patent
Utility
US 4,232,115 · App. 06/015,005
Bleachable photographic sensitizing dyes
Inventor:
Ross A. Lee
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Feb 22, 1979
Inventor
Ross A. Lee
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.