Granted Patent
Utility
US 4,457,069 · App. 06/459,349
Sharpening device for a chain saw
Inventor:
Albert R. Close
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Jan 20, 1983
Inventor
Albert R. Close
Assignee (at issue)
McCulloch Corporation
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.