Granted Patent
Utility
US 4,918,017 · App. 07/305,688
Screen assembly for screening elastomeric material
Inventors:
Arthur W. Greenstreet, Gerardo P. Elia, Charles D. Spragg
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: Feb 3, 1989
Inventors
Arthur W. Greenstreet
Gerardo P. Elia
Charles D. Spragg
Assignee (at issue)
Bridgestone Firestone
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.