Granted Patent
Utility
US 4,263,397 · App. 05/907,608
Photographic products
Inventors:
Akira Horikoshi, Zene Kumagai
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: May 19, 1978
Inventors
Akira Horikoshi
Zene Kumagai
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.