Granted Patent
Utility
US 4,604,461 · App. 06/772,096
5-substituted-9-disubstituted amino-12-substituted carbonylbenzo[a]phenoxazines
Inventor:
William M. Hung
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Sep 3, 1985
Inventor
William M. Hung
Assignee (at issue)
Hilton Davis Chemical Co.
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.