Granted Patent
Utility
US 6,006,629 · App. 09/104,214
Automatic chain sharpening device mounted on a chain saw
Inventor:
Per-Olof Lofgren
Patented Case
View Patent ↗
Granted: Dec 28, 1999
Filed: Jun 25, 1998
Inventor
Per-Olof Lofgren
Assignee (at issue)
SANDVIK LTD
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.