Granted Patent
Utility
US 4,808,726 · App. 07/091,849
Process for preparation of guanidine derivative
Inventors:
Isao Hashimoto, Ikuo Tomino, Houji Kato, Noriaki Kihara, Teruaki Mukaiyama
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Sep 1, 1987
Inventors
Isao Hashimoto
Ikuo Tomino
Houji Kato
Noriaki Kihara
Teruaki Mukaiyama
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.