Granted Patent
Utility
US 6,568,090 · App. 09/683,008
Cosmetic pencil sharpener
Inventors:
Robert J. Sheffler, Charles Chang
Patented Case
View Patent ↗
Granted: May 27, 2003
Filed: Nov 8, 2001
Inventors
Robert J. Sheffler
Charles Chang
Assignee (at issue)
Charles Chang
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.