Granted Patent
Utility
US 5,021,167 · App. 07/377,880
Method for separating liquid from water using amine containing polymers
Inventors:
Michael L. Braden, Stephan J. Allenson
Patented Case
View Patent ↗
Granted: Jun 4, 1991
Filed: Jul 10, 1989
Inventors
Michael L. Braden
Stephan J. Allenson
Assignee (at issue)
Nalco Chemical Company
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.