Granted Patent
Utility
US 4,313,731 · App. 06/186,372
Mono-azo compound, mono-azo dye and dyeing process for polyester fibers
Inventors:
Seiichi Imahori, Kiyoshi Himeno
Patented Case
View Patent ↗
Granted: Feb 2, 1982
Filed: Sep 12, 1980
Inventors
Seiichi Imahori
Kiyoshi Himeno
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.