Granted Patent
Utility
US 5,025,403 · App. 07/429,437
Fraction entry and display
Inventor:
Bruce A. Stephens
Patented Case
View Patent ↗
Granted: Jun 18, 1991
Filed: Oct 30, 1989
Inventor
Bruce A. Stephens
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.