Granted Patent
Utility
US 4,234,730 · App. 06/078,117
Process of preparing selective mixtures of piperazine and ethylenediamine
Inventors:
Thomas T. McConnell, Thomas H. Cour
Patented Case
View Patent ↗
Granted: Nov 18, 1980
Filed: Sep 24, 1979
Inventors
Thomas T. McConnell
Thomas H. Cour
Assignee (at issue)
Texaco Development 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.