Granted Patent
Utility
US 4,801,696 · App. 07/065,184
Phenylazocyanothiopheneazoaniline dyes for dyeing cellulose-containing fibers in blue to bluish green shades
Inventors:
Toshio Niwa, Kiyoshi Himeno, Toshio Hihara, Shuichi Maeda
Patented Case
View Patent ↗
Granted: Jan 31, 1989
Filed: Jun 22, 1987
Inventors
Toshio Niwa
Kiyoshi Himeno
Toshio Hihara
Shuichi Maeda
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.