Granted Patent
Utility
US 4,701,558 · App. 06/799,051
Method for purifying aqueous acrylamide solution
Inventors:
Yasumasa Yamaguchi, Masashi Nishida
Patented Case
View Patent ↗
Granted: Oct 20, 1987
Filed: Nov 18, 1985
Inventors
Yasumasa Yamaguchi
Masashi Nishida
Assignee (at issue)
Nitto Chemical Industry Co., 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.