Granted Patent
Utility
US 4,398,263 · App. 06/252,944
Calculator having integrating function
Inventor:
Hisashi Ito
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Apr 10, 1981
Inventor
Hisashi Ito
Assignee (at issue)
CASIO COMPUTER CO., LTD.
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.