Granted Patent
Utility
US 4,797,447 · App. 06/766,216
Impact resistant blends of thermoplastic polyesters and modified block copolymers
Inventors:
William P. Gergen, Robert G. Lutz
Patented Case
View Patent ↗
Granted: Jan 10, 1989
Filed: Aug 16, 1985
Inventors
William P. Gergen
Robert G. Lutz
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.