Granted Patent
Utility
US 6,301,791 · App. 09/543,888
Sharpener for soft-core pencils
Inventor:
Fritz Lüttgens
Patented Case
View Patent ↗
Granted: Oct 16, 2001
Filed: Apr 6, 2000
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.