Granted Patent
Utility
US 4,692,471 · App. 06/947,339
Expandable polypropylene interpolymer particles
Inventor:
Kent D. Fudge
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Dec 29, 1986
Inventor
Kent D. Fudge
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.