Granted Patent
Utility
US 4,491,648 · App. 06/614,364
Polymer blend composition
Inventors:
Daniel P. Durbin, Robert G. Lutz
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: May 29, 1984
Inventors
Daniel P. Durbin
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.