Granted Patent
Utility
US 4,973,649 · App. 07/319,306
Novel hindered diamine/imido prepolymers
Inventor:
Yves Camberlin
Patented Case
View Patent ↗
Granted: Nov 27, 1990
Filed: Mar 3, 1989
Inventor
Yves Camberlin
Assignee (at issue)
RHONE-POULENC CHIMIE
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.