Granted Patent
Utility
US 4,621,136 · App. 06/334,005
Phenyl azo cyanothienyl azo anilino dyestuffs
Inventors:
Seiichi Imahori, Kiyoshi Himeno, Shuichi Maeda
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: Dec 23, 1981
Inventors
Seiichi Imahori
Kiyoshi Himeno
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.