Granted Patent
Utility
US 5,667,427 · App. 08/530,840
Method and apparatus for sharpening curved blades
Inventors:
Forrest A. Airhart, Jeffrey A. Whited
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: Sep 20, 1995
Inventors
Forrest A. Airhart
Jeffrey A. Whited
Assignee (at issue)
Bettcher 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.