Granted Patent
Utility
US 4,841,029 · App. 07/186,656
Diazo colors and dyeing method using the same
Inventors:
Yoshiaki Kato, Toshio Hihara
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Apr 19, 1988
Inventors
Yoshiaki Kato
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.