Granted Patent
Utility
US 4,885,714 · App. 06/923,933
Calculator having a user-accessible object stack for the uniform application of mathematical functions and logical operations to a multiplicity of object types
Inventors:
Gabe L. Eisenstein, Laurence W. Grodd, Paul J. McClellan, Robert Miller, Charles M. Patton, William C. Wickes
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Oct 27, 1986
Inventors
Gabe L. Eisenstein
Laurence W. Grodd
Paul J. McClellan
Robert Miller
Charles M. Patton
William C. Wickes
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.