Granted Patent
Utility
US 4,692,472 · App. 06/859,976
Divinylbenzene in expandable beads for cup molding
Inventors:
Alvin R. Ingram, Adolph V. DiGiulio
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: May 5, 1986
Inventors
Alvin R. Ingram
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.