Granted Patent
Utility
US 4,268,621 · App. 06/061,400
Direct positive photographic material
Inventors:
Keiji Ogi, Takashi Sasaki, Kenichiro Okaniwa, Yasuo Tosaka
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Jul 27, 1979
Inventors
Keiji Ogi
Takashi Sasaki
Kenichiro Okaniwa
Yasuo Tosaka
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.