Granted Patent
Utility
US 4,436,906 · App. 06/380,320
Anthraquinone dyes for cellulose-containing fibers and process for producing the same
Inventors:
Toshio Niwa, Toshio Hihara
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: May 20, 1982
Inventors
Toshio Niwa
Toshio Hihara
Assignee (at issue)
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.