Granted Patent
Utility
US 4,278,732 · App. 06/192,670
Antilumping expandable styrene polymers
Inventor:
John P. Spicuzza, Jr.
Patented Case
View Patent ↗
Granted: Jul 14, 1981
Filed: Oct 1, 1980
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.