Granted Patent
Utility
US 4,248,961 · App. 06/035,362
Material for color photography
Inventors:
Remon Hagen, Mario Fryberg
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: May 2, 1979
Inventors
Remon Hagen
Mario Fryberg
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.