Granted Patent
Utility
US 4,987,214 · App. 07/495,581
Imide type prepolymer composition comprising unsaturated bis imide, diamine, and a tertiary butyl hydroquinone polymerization inhibitor
Inventors:
Kojiro Kan, Toru Tomoshige, Hideya Aoki
Patented Case
View Patent ↗
Granted: Jan 22, 1991
Filed: Mar 20, 1990
Inventors
Kojiro Kan
Toru Tomoshige
Hideya Aoki
Assignee (at issue)
Mitsui Petrochemical Industries, Ltd.
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.