Granted Patent
Utility
US 4,788,284 · App. 07/084,311
Diphenylimidazole type dyes
Inventors:
Toyoaki Masukawa, Yasuo Tsuda, Hidetaka Ninomiya, Noritaka Nakayama
Patented Case
View Patent ↗
Granted: Nov 29, 1988
Filed: Aug 10, 1987
Inventors
Toyoaki Masukawa
Yasuo Tsuda
Hidetaka Ninomiya
Noritaka Nakayama
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.