Granted Patent
Utility
US 4,134,847 · App. 05/801,425
Method for the production of a color developer and the obtained color developer
Inventors:
Shin-ichi Oda, Tosaku Okamoto, Akira Nakanishi, Takio Kuroda
Patented Case
View Patent ↗
Granted: Jan 16, 1979
Filed: May 27, 1977
Inventors
Shin-ichi Oda
Tosaku Okamoto
Akira Nakanishi
Takio Kuroda
Assignees (at issue)
Kanzaki Paper Manufacturing Co., Ltd.
Sanko Kagaku 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.