Previous calculation reuse in a calculator

Details Previous calculation reuse in a calculator Previous calculation reuse in a calculator

2007-09-18

2007-09-18

Ngo, Chuong D. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Having specialized input

C708S172000

Reexamination Certificate

active

10636778

ABSTRACT:
A method of reusing an expression in a hand-held calculator and corresponding apparatus therefore are described. At least one user-entered expression is received and displayed. The user-entered expression is evaluated and the result displayed. A first user input requesting reuse of one of the previously displayed expressions is received and one of the previously displayed expressions is displayed for editing by the user. A second user input requesting reuse of one of the previously displayed expressions is received and one of the previously displayed expressions is displayed for editing by the user at the same time as the previously displayed expression responsive to the first user input.

REFERENCES:
patent: 5067102 (1991-11-01), Eisenstein
patent: 5189633 (1993-02-01), Bonadio
patent: 6795838 (2004-09-01), Kataoka
patent: 6956560 (2005-10-01), Brothers et al.
Texas Instruments: TI-89/Voyage™ 200 Calculator Home Screen, May 30, 2003 http://web.archive.org/web/20030530170656/http://education.ti.com/downloads/guidebooks/eng/calc—home-eng.pdf.
Ralph Brown: “Napier” Apr. 30, 2001 http://web.archive.org/web/20010430133653/http://www.nca-corp.com/Napier/Distributions/NapierDocDOC.exe.

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