Granted Patent
Utility
US 4,495,274 · App. 06/487,216
Direct-positive silver halide photographic material
Inventor:
Kazuhiro Yoshida
Patented Case
View Patent ↗
Granted: Jan 22, 1985
Filed: Apr 21, 1983
Inventor
Kazuhiro Yoshida
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.