Granted Patent
Utility
US 4,686,286 · App. 06/735,561
Disazo reactive dyestuffs for cellulose fibers
Inventors:
Toshio Niwa, Yoshiaki Katoh
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: May 17, 1985
Inventors
Toshio Niwa
Yoshiaki Katoh
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.