Granted Patent
Utility
US 4,954,568 · App. 07/311,009
Impact resistant blends of thermoplastic polyesters and modified block copolymers
Inventors:
Richard Gelles, Carl L. Willis, Robert G. Lutz, William P. Gergen
Patented Case
View Patent ↗
Granted: Sep 4, 1990
Filed: Feb 15, 1989
Inventors
Richard Gelles
Carl L. Willis
Robert G. Lutz
William P. Gergen
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.