Granted Patent
Utility
US 4,647,701 · App. 06/613,473
Processes for producing diethylenetriamine from monoethanolamine
Inventor:
Charles A. Gibson
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: May 23, 1984
Inventor
Charles A. Gibson
Assignee (at issue)
Union Carbide Corporation
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.