Reading stroke codes
US4289957A · kind A · utility
67Cited by
8References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 17, 1979 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | Apr 17, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10871
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The reading of an identification card with stroke code comprises sweeping of a control area by a laser beam, detection by photo-detectors of light reflected by the card and from the edges thereof, amplification, selection by a chronometer of the useful signal, placing of the signal into a buffer memory, and treatment by a micro-processor and an ordinator for reconstitution of a complete message by means of two successive incomplete sweeps comprising at least one upper or lower security character.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.