Granted Patent
Utility
US 4,852,057 · App. 06/923,921
Algebraic expression manipulation method and implementation for an electronic data processing apparatus
Inventor:
Charles M. Patton
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Oct 27, 1986
Inventor
Charles M. Patton
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.