Granted Patent
Utility
US 4,385,156 · App. 06/364,297
Process for producing coated styrenic polymer beads for heat resistant foams
Inventors:
Alvin R. Ingram, Harold A. Wright, Walter O. Pillar, Adolph V. DiGiulio, Kenneth D. Thom
Patented Case
View Patent ↗
Granted: May 24, 1983
Filed: Apr 1, 1982
Inventors
Alvin R. Ingram
Harold A. Wright
Walter O. Pillar
Adolph V. DiGiulio
Kenneth D. Thom
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.