Granted Patent
Utility
US 4,906,248 · App. 07/177,875
Dyeing assistant composition for cellulose fibers
Inventors:
Naoki Kyochika, Shigeru Nagao
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Mar 24, 1988
Inventors
Naoki Kyochika
Shigeru Nagao
Assignee (at issue)
Kao Corporation
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.