Granted Patent
Utility
US 4,180,427 · App. 05/861,562
Foamed thermoplastic material laminated with a sheet-like covering material
Inventor:
Paul Bertsch
Patented Case
View Patent ↗
Granted: Dec 25, 1979
Filed: Dec 16, 1977
Inventor
Paul Bertsch
Assignee (at issue)
Primex Plastics Corporation
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.