Granted Patent
Utility
US 4,429,175 · App. 06/437,029
Process for the production of ethylbenzene
Inventor:
John L. Cihonski
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Oct 27, 1982
Inventor
John L. Cihonski
Assignee (at issue)
El Paso Products Company
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.