Granted Patent
Utility
US 4,409,338 · App. 06/462,156
Process for forming fast-cool vinyl aromatic expandable polymers
Inventor:
Adolph V. DiGiulio
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Jan 31, 1983
Inventor
Adolph V. DiGiulio
Assignee (at issue)
Atlantic Richfield 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.