Dual stripe optical data card
US4683371A · kind A · utility
59Cited by
20References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1985 |
| Grant date | Jul 28, 1987 |
| Priority date | — |
| Expiry date | Aug 6, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B17/34
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical data card having a pair of spaced apart information strips. One strip has pre-recorded programs or data and is always a non-erasable strip. This strip may be either a reflective direct-read-after-write non-erasable type or may be a read-only optical memory (ROOM) strip. Another strip serves as a temporary, scratchpad or cache memory and is either a reflective DRAW strip of the erasable type or a DRAW non-erasable strip which is at least partially blank, with sufficient space for temporary memory needs over an extended period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.