Granted Patent
Utility
US 4,602,091 · App. 06/573,773
Production of ethylenediamine and N-aminoethylpiperazine from piperazine
Inventor:
Michael E. Brennan
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Jan 25, 1984
Inventor
Michael E. Brennan
Assignee (at issue)
Texaco 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.