Granted Patent
Utility
US 5,204,415 · App. 07/797,839
Polymers prepared from dipropargyl ether of alpha, alpha'-bis (4-hydroxyphenyl)-para-diisopropylbenzene
Inventor:
Anthony M. Pigneri
Patented Case
View Patent ↗
Granted: Apr 20, 1993
Filed: Nov 26, 1991
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.