Granted Patent
Utility
US 5,001,281 · App. 07/392,506
Isomerization of bis-phenols
Inventor:
Simon M. Li
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Aug 11, 1989
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.