Method of calibrating a magnetic character bearing document
US5488293A · kind A · utility
2Cited by
1References
4Claims
0Family size
Inventor
Key dates
| Filing date | May 4, 1994 |
| Grant date | Jan 30, 1996 |
| Priority date | — |
| Expiry date | May 4, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/455
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of calibrating a document having a magnetic character on the document comprises measuring by testing equipment, magnetic flux level of a known current passed through a specified conductor to establish a first signal having a first signal strength represented by a unit value, passing the document through the testing equipment to provide a second signal having a second signal strength produced by magnetic flux of the character and assigning a value to the second signal strength in comparison to and shown in units as a percentage of the unit value of the first signal strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.