Granted Patent
Utility
US 4,474,938 · App. 06/520,043
Process for polymerization of thermotropic polyesters and polyesters
Inventor:
John C. Richardson
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Aug 4, 1983
Inventor
John C. Richardson
Assignee (at issue)
Monsanto Company
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.