Granted Patent
Utility
US 5,146,006 · App. 07/722,983
Process for preparing tetraphenoic compounds
Inventor:
Simon M. Li
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: Jun 28, 1991
Inventor
Simon M. Li
Assignee (at issue)
SHELL OIL 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.