Granted Patent
Utility
US 4,742,168 · App. 06/891,087
Anti-caking agent for triethylenediamine
Inventor:
Robert L. Zimmerman
Patented Case
View Patent ↗
Granted: May 3, 1988
Filed: Jul 31, 1986
Inventor
Robert L. Zimmerman
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.