Granted Patent
Utility
US 4,304,850 · App. 06/165,060
Photographic element for color diffusion transfer process
Inventors:
Mikio Koyama, Satoru Ikeuchi, Noboru Mizukura, Hideaki Iwama
Patented Case
View Patent ↗
Granted: Dec 8, 1981
Filed: Jul 1, 1980
Inventors
Mikio Koyama
Satoru Ikeuchi
Noboru Mizukura
Hideaki Iwama
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
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.