Granted Patent
Utility
US 5,298,380 · App. 07/939,289
Photographic material which contains a UV absober
Inventor:
David G. Leppard
Patented Case
View Patent ↗
Granted: Mar 29, 1994
Filed: Sep 1, 1992
Inventor
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.