Granted Patent
Utility
US 4,578,429 · App. 06/646,391
Selectively hydrogenated block copolymers modified with acid compounds or derivatives
Inventors:
William P. Gergen, Robert G. Lutz, Richard Gelles
Patented Case
View Patent ↗
Granted: Mar 25, 1986
Filed: Aug 31, 1984
Inventors
William P. Gergen
Robert G. Lutz
Richard Gelles
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.