Granted Patent
Utility
US 4,200,241 · App. 05/948,491
Pulverizing and classifying apparatus with contaminant take-out
Inventor:
Norman E. Williams
Patented Case
View Patent ↗
Granted: Apr 29, 1980
Filed: Oct 4, 1978
Inventor
Norman E. Williams
Assignee (at issue)
Bepex, GmbH
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.