Granted Patent
Utility
US 4,886,855 · App. 07/165,462
Polymer blends of polycarbonate styrene terpolymer and ABS resin
Inventor:
Charles F. Parsons
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Mar 8, 1988
Inventor
Charles F. Parsons
Assignee (at issue)
Borg-Warner Chemicals, Inc.
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.