Granted Patent
Utility
US 4,461,428 · App. 06/350,070
Apparatus for reducing fraible materials into coarse and fine fractions
Inventor:
Robert M. Williams
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: Feb 18, 1982
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.