Granted Patent
Utility
US 5,135,643 · App. 07/590,001
Process for producing aromatic compounds
Inventor:
John W. Ward
Patented Case
View Patent ↗
Granted: Aug 4, 1992
Filed: Sep 28, 1990
Inventor
John W. Ward
Assignee (at issue)
Union Oil Company of California
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.