Granted Patent
Utility
US 4,963,644 · App. 07/408,354
Process for crystallization of polyethylene naphthalate
Inventor:
Ben Duh
Patented Case
View Patent ↗
Granted: Oct 16, 1990
Filed: Sep 18, 1989
Inventor
Ben Duh
Assignee (at issue)
THE GOODYEAR TIRE & RUBBER 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.