Granted Patent
Utility
US 5,780,549 · App. 08/681,752
Polybutene polymers as modifiers for PVC
Inventor:
Paul Ludwig
Patented Case
View Patent ↗
Granted: Jul 14, 1998
Filed: Jul 29, 1996
Inventor
Paul Ludwig
Assignee (at issue)
General Electric 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.