Granted Patent
Utility
US 6,192,594 · App. 09/059,587
Fraction ruler
Inventor:
Sally L. Wackowski
Patented Case
View Patent ↗
Granted: Feb 27, 2001
Filed: Apr 14, 1998
Inventor
Sally L. Wackowski
Assignee (at issue)
Extra Measures, 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.