Granted Patent
Utility
US 4,268,593 · App. 06/091,275
Recording material for color photography
Inventors:
David G. Leppard, Michael Rasberger
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Nov 5, 1979
Inventors
David G. Leppard
Michael Rasberger
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.