Granted Patent
Utility
US 4,994,530 · App. 07/440,674
Polymeric compounds
Inventors:
Terence Etherington, Victor Kolodziejczyk
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Nov 22, 1989
Inventors
Terence Etherington
Victor Kolodziejczyk
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND 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.