Granted Patent
Utility
US 4,917,991 · App. 07/210,397
Direct positive silver halide photographic material
Inventors:
Yasuo Tosaka, Keiji Ogi, Atushi Kamitakahara
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Jun 23, 1988
Inventors
Yasuo Tosaka
Keiji Ogi
Atushi Kamitakahara
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.