Granted Patent
Utility
US 4,773,466 · App. 07/132,099
Process for preparing polycarbonate copolymer foam suitable for lost foam casting
Inventors:
Michael J. Cannarsa, Haven S. Kesling, Jr., Hsiang-Ning Sun
Patented Case
View Patent ↗
Granted: Sep 27, 1988
Filed: Dec 14, 1987
Inventors
Michael J. Cannarsa
Haven S. Kesling, Jr.
Hsiang-Ning Sun
Assignee (at issue)
Arco Chemical 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.