Electronic calculator
US6820800B2 · kind B2 · utility
0Cited by
3References
18Claims
0Family size
Inventor
Key dates
| Filing date | Feb 3, 2003 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | May 12, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B19/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electronic calculator having means for enabling a user to input a calculation, characterized in that the calculator has a mode of operation in which the user is required to input additionally at least one estimate of the result of the calculation before the correct result of the calculation is displayed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.