Granted Patent
Utility
US 4,626,590 · App. 06/668,739
Reactive monoazo and disazo pyridone dyestuffs containing a halo-substituted 6-member nitrogen-containing heterocyclic ring
Inventors:
Toshio Niwa, Kiyoshi Himeno, Toshio Hihara, Yukiharu Shimizu
Patented Case
View Patent ↗
Granted: Dec 2, 1986
Filed: Nov 6, 1984
Inventors
Toshio Niwa
Kiyoshi Himeno
Toshio Hihara
Yukiharu Shimizu
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.