Method for writing and viewing magnetic human readable characters and viewing means therefor
US4101905A · kind A · utility
4Cited by
6References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1976 |
| Grant date | Jul 18, 1978 |
| Priority date | — |
| Expiry date | Dec 10, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/3437
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A multi-track magnetic recording head is used to record data in human readable form on a magnetic track on a record medium. A viewer, having a viewing window containing microencapsulated ferromagnetic particles, is used to read the data. When the viewing window is placed in operative proximity with the magnetic track, an image corresponding to the data on the track is formed on the viewing window to enable a user of the record medium to read the data thereon. The image on the viewing window is erased after reading by providing relative movement between the viewing window and a magnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.