Granted Patent
Utility
US 5,189,221 · App. 07/617,339
Amine separation process
Inventors:
Roger G. Duranleau, Robert L. Zimmerman
Patented Case
View Patent ↗
Granted: Feb 23, 1993
Filed: Nov 19, 1990
Inventors
Roger G. Duranleau
Robert L. Zimmerman
Assignee (at issue)
Texaco Chemical Inc.
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.