Granted Patent
Utility
US 4,305,901 · App. 05/809,739
Wet extrusion of reinforced thermoplastic
Inventors:
David S. Prince, Walter E. Voisinet
Patented Case
View Patent ↗
Granted: Dec 15, 1981
Filed: Jun 24, 1977
Inventors
David S. Prince
Walter E. Voisinet
Assignee (at issue)
National Gypsum 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.