Granted Patent
Utility
US 4,741,980 · App. 06/908,603
Method for increasing color-fastness of organic coloring matter
Inventor:
Yutaka Kaneko
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Sep 18, 1986
Inventor
Yutaka Kaneko
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.