Granted Patent
Utility
US 4,359,523 · App. 06/291,697
Photographic element containing a UV-filter layer
Inventor:
Stephen Postle
Patented Case
View Patent ↗
Granted: Nov 16, 1982
Filed: Aug 10, 1981
Inventor
Stephen Postle
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.