Granted Patent
Utility
US 4,657,704 · App. 06/824,947
Production of aminoalkylsulfonic acids
Inventors:
Isamu Yamamoto, Yoshiaki Noguchi, Kouzou Iwasaki, Kenichi Arai
Patented Case
View Patent ↗
Granted: Apr 14, 1987
Filed: Feb 3, 1986
Inventors
Isamu Yamamoto
Yoshiaki Noguchi
Kouzou Iwasaki
Kenichi Arai
Assignee (at issue)
Mitsui Toatsu Chemicals, Incorporated
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.