Granted Patent
Utility
US 4,287,291 · App. 06/096,311
Diffusion transfer color photographic film unit
Inventor:
Kaoru Onodera
Patented Case
View Patent ↗
Granted: Sep 1, 1981
Filed: Nov 21, 1979
Inventor
Kaoru Onodera
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.