Granted Patent
Utility
US 4,524,917 · App. 06/471,701
Air seal and lubrication system for roller grinding mills
Inventor:
Robert M. Williams
Patented Case
View Patent ↗
Granted: Jun 25, 1985
Filed: Mar 3, 1983
Inventor
Robert M. Williams
Assignee (at issue)
WILLIAMS PATENT CRUSHER AND PULVERIZER 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.