Granted Patent
Utility
US 5,543,566 · App. 08/305,293
Process for preparing amino-polycarboxylic acids or salts thereof
Inventors:
Kiyobumi Takahashi, Teturo Nakahama
Patented Case
View Patent ↗
Granted: Aug 6, 1996
Filed: Sep 15, 1994
Inventors
Kiyobumi Takahashi
Teturo Nakahama
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.