Granted Patent
Utility
US 4,912,013 · App. 07/268,632
Photosensitive diazo composition and photosensitive diazo lithographic printing plate with metal complex dyes and color changing agent
Inventors:
Norihito Suzuki, Kiyoshi Goto, Yoshihiro Maeda, Shigeki Shimizu
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: Nov 8, 1988
Inventors
Norihito Suzuki
Kiyoshi Goto
Yoshihiro Maeda
Shigeki Shimizu
Assignees (at issue)
Konishiroku Photo Industry Co., Ltd.
Mitsubishi Chemical Industries, 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.