Granted Patent
Utility
US 4,570,567 · App. 06/538,024
Air classification in a spray grainer
Inventor:
William G. Bridges
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Sep 30, 1983
Inventor
William G. Bridges
Assignee (at issue)
Olin Corporation
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.