Granted Patent
Utility
US 4,505,715 · App. 06/616,392
Monoazo dyestuff mixtures to dye polyester yellow
Inventors:
Toshio Niwa, Kiyoshi Himeno, Junji Yoshihara
Patented Case
View Patent ↗
Granted: Mar 19, 1985
Filed: Jun 1, 1984
Inventors
Toshio Niwa
Kiyoshi Himeno
Junji Yoshihara
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.