Granted Patent
Utility
US 4,048,272 · App. 05/646,293
Method for preparing improved expanded polystyrene sheet
Inventor:
John P. Spicuzza, Jr.
Patented Case
View Patent ↗
Granted: Sep 13, 1977
Filed: Jan 2, 1976
Inventor
John P. Spicuzza, Jr.
Assignee (at issue)
Arco Polymers, Inc.
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.