Granted Patent
Utility
US 4,719,296 · App. 06/822,449
Spiroxazine compounds
Inventors:
Masahiro Irie, Shuichi Maeda
Patented Case
View Patent ↗
Granted: Jan 12, 1988
Filed: Jan 27, 1986
Inventors
Masahiro Irie
Shuichi Maeda
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.