Granted Patent
Utility
US 4,886,912 · App. 07/156,668
Cyanoguanidine derivative and process for preparation thereof
Inventors:
Hiroaki Tan, Keiichi Yokoyama, Noriaki Kihara
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Feb 17, 1988
Inventors
Hiroaki Tan
Keiichi Yokoyama
Noriaki Kihara
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.