Granted Patent
Utility
US 5,070,007 · App. 07/651,612
Color photographic materials comprising phenolic thiane derivatives as light and thermal oxidation stabilizers
Inventors:
Jean Rody, David G. Leppard
Patented Case
View Patent ↗
Granted: Dec 3, 1991
Filed: Feb 6, 1991
Inventors
Jean Rody
David G. Leppard
Assignee (at issue)
Ciba-Geigy
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.