Granted Patent
Utility
US 4,775,718 · App. 06/948,374
Modified polyester, methods of preparing same and compositions comprising said modified polyester
Inventor:
Antonius A. Broekhuis
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Dec 31, 1986
Inventor
Antonius A. Broekhuis
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.