Granted Patent
Utility
US 5,192,816 · App. 07/799,133
Pipe inner surface coating composition
Inventor:
Hiroshi Iizuka
Patented Case
View Patent ↗
Granted: Mar 9, 1993
Filed: Nov 27, 1991
Inventor
Hiroshi Iizuka
Assignee (at issue)
Mitsui Petrochemical 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.