Granted Patent
Utility
US 4,746,477 · App. 06/875,856
Production of partially foamed extruded plastic products
Inventors:
Sheldon M. Wecker, Lou Kohl
Patented Case
View Patent ↗
Granted: May 24, 1988
Filed: Jun 18, 1986
Inventors
Sheldon M. Wecker
Lou Kohl
Assignee (at issue)
James River-Norwalk
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.