Granted Patent
Utility
US 4,493,919 · App. 06/502,407
Polymer blend composition comprising two block polymers a vinyl aromatic copolymer and a polyester
Inventors:
Daniel P. Durbin, Robert G. Lutz, Richard L. Danforth
Patented Case
View Patent ↗
Granted: Jan 15, 1985
Filed: Jun 8, 1983
Inventors
Daniel P. Durbin
Robert G. Lutz
Richard L. Danforth
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.