Granted Patent
Utility
US 4,307,134 · App. 06/219,066
Process for producing plasticized elastomer-styrene coated beads
Inventors:
Ralph Milkovich, David R. Warfel, Elizabeth A. Blommers, Alvin R. Ingram
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Dec 22, 1980
Inventors
Ralph Milkovich
David R. Warfel
Elizabeth A. Blommers
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.