Granted Patent
Utility
US 4,882,428 · App. 07/167,231
Azaporphyrin compounds
Inventor:
Masahiro Irie
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Mar 11, 1988
Inventor
Masahiro Irie
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.