Granted Patent
Utility
US 4,987,272 · App. 07/386,079
Dipropargyl ether of alpha, alpha'-bis (4-hydroxypenyl)-paradiisopropylbenzene
Inventor:
Anthony M. Pigneri
Patented Case
View Patent ↗
Granted: Jan 22, 1991
Filed: Jul 28, 1989
Inventor
Anthony M. Pigneri
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.