Granted Patent
Utility
US 4,868,243 · App. 07/152,706
High impact resistant blends of thermoplastic polyesters and modified block copolymers
Inventors:
Richard Gelles, Carl L. Willis, Michael J. Modic
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Feb 5, 1988
Inventors
Richard Gelles
Carl L. Willis
Michael J. Modic
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.