Granted Patent
Utility
US 4,547,527 · App. 06/679,785
Impregnation suspension system for expandable styrene/maleic anhydride particles
Inventor:
Alvin R. Ingram
Patented Case
View Patent ↗
Granted: Oct 15, 1985
Filed: Dec 10, 1984
Inventor
Alvin R. Ingram
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.