Granted Patent
Utility
US 4,983,683 · App. 07/433,020
Polycyanate esters of polyhydric phenols blended with thermoplastic polymers
Inventor:
David A. Shimp
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Nov 6, 1989
Inventor
David A. Shimp
Assignee (at issue)
Hi-Tek Polymers, 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.