Calculator with equation display device
US4386412A · kind A · utility
39Cited by
5References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1980 |
| Grant date | May 31, 1983 |
| Priority date | — |
| Expiry date | Dec 9, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F15/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A calculator in which when numerical information and function information are sequentially input using ten keys and function keys of a key input section for obtaining a calculation result according to a calculation formula, the input information is stored in a memory. The operation is then performed and, simultaneously, a character formula universally representing the calculation formula with the input numerals replaced with characters is prepared. This character formula is displayed by the display section so that the input condition may be easily confirmed and input errors may be prevented with certainty.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.