Granted Patent
Utility
US 4,337,191 · App. 06/091,003
Polyester of para-hydroxy benzoic acid, 2,6-naphthalene dicarboxylic acid, terephthalic acid and methylhydroquinone exhibiting improved hydrolytic stability and which is capable of forming an anisotropic melt
Inventor:
Nicolai A. Favstritsky
Patented Case
View Patent ↗
Granted: Jun 29, 1982
Filed: Nov 5, 1979
Inventor
Nicolai A. Favstritsky
Assignee (at issue)
Fiber Industries, 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.