Granted Patent
Utility
US 4,251,591 · App. 06/080,645
Polyvinylbutyral laminates
Inventor:
Henry K. Chi
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Oct 1, 1979
Inventor
Henry K. Chi
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.