Granted Patent
Utility
US 4,412,659 · App. 06/229,661
Shredding mill
Inventors:
Roger Brentley Crawford, Duane Sanders
Patented Case
View Patent ↗
Granted: Nov 1, 1983
Filed: Jan 30, 1981
Inventors
Roger Brentley Crawford
Duane Sanders
Assignee (at issue)
Thermoguard Insulation Co.
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.