Granted Patent
Utility
US 6,279,237 · App. 09/394,197
Sharpener
Inventor:
Fritz Lüttgens
Patented Case
View Patent ↗
Granted: Aug 28, 2001
Filed: Sep 10, 1999
Inventor
Fritz Lüttgens
Assignee (at issue)
KUM LLC
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.