Granted Patent
Utility
US 4,233,400 · App. 06/016,988
Light-sensitive silver halide photographic material containing tetrazolium compounds
Inventors:
Mitsuto Fujiwhara, Syunji Matsuo, Toyoaki Masukawa, Yutaka Kaneko, Mikio Kawasaki
Patented Case
View Patent ↗
Granted: Nov 11, 1980
Filed: Mar 2, 1979
Inventors
Mitsuto Fujiwhara
Syunji Matsuo
Toyoaki Masukawa
Yutaka Kaneko
Mikio Kawasaki
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.