Granted Patent
Utility
US 4,400,539 · App. 06/307,215
Process for the manufacture of ethylenediamine
Inventors:
Charles A. Gibson, John Winters
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Sep 30, 1981
Inventors
Charles A. Gibson
John Winters
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.