Granted Patent
Utility
US 4,407,935 · App. 06/339,816
Photographic recording material
Inventors:
Mario Fryberg, David G. Leppard
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Jan 15, 1982
Inventors
Mario Fryberg
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.