Granted Patent
Utility
US 5,656,714 · App. 08/459,889
Polyester from terephthalic acid, 6-hydroxy-2-naphthoic acid, 4-hydroxybenzoic acid, 4,4'-biphenol and resorcinol
Inventors:
Sunny S. Shen, Larry F. Charbonneau
Patented Case
View Patent ↗
Granted: Aug 12, 1997
Filed: Jun 2, 1995
Inventors
Sunny S. Shen
Larry F. Charbonneau
Assignee (at issue)
Hoechst Celanese Corporation
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.