Granted Patent
Utility
US 4,661,564 · App. 06/886,483
Modified styrenic polymer beads
Inventor:
Adolph V. DiGiulio
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Jul 17, 1986
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.