Granted Patent
Utility
US 4,378,094 · App. 06/234,633
Material reducing mill by-pass for uncrushables
Inventor:
Robert M. Williams
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Feb 17, 1981
Inventor
Robert M. Williams
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.