Granted Patent
Utility
US 4,954,583 · App. 07/364,275
Arylcyclobutene carboxylate esters
Inventor:
Pen-Chung Wang
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Jun 12, 1989
Inventor
Pen-Chung Wang
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.