Granted Patent
Utility
US 4,677,134 · App. 06/876,560
Expandable polypropylene interpolymer particles
Inventor:
Kent D. Fudge
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Jun 20, 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.