Granted Patent
Utility
US 4,331,028 · App. 06/166,612
Method and apparatus for determining the sharpness of a saw chain
Inventor:
Duane M. Gibson
Patented Case
View Patent ↗
Granted: May 25, 1982
Filed: Jul 7, 1980
Inventor
Duane M. Gibson
Assignee (at issue)
Omark Industries, Inc.
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.