Granted Patent
Utility
US 4,639,504 · App. 06/734,953
Production of thermally stabilized aromatic polyesters
Inventor:
Steve G. Cottis
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: May 16, 1985
Inventor
Steve G. Cottis
Assignee (at issue)
Dart 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.