Granted Patent
Utility
US 4,906,774 · App. 07/078,309
Process for preparing diamines
Inventors:
George P. Speranza, Jiang-Jen Lin, Michael Cuscurida
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Jul 27, 1987
Inventors
George P. Speranza
Jiang-Jen Lin
Michael Cuscurida
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.