Digital data record
US4571713A · kind A · utility
4Cited by
26References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1984 |
| Grant date | Feb 18, 1986 |
| Priority date | — |
| Expiry date | Jun 28, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/3027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An information record has a body of photographic film, paper, plastics material or the like, in which digital information is carried on a body in equal-radii, arcuate rows which extend across the body. The information may be stored as dark spots, light spots or dark-to-light or light-to-dark transitions with respect to transparent substances and in reflective areas, non-reflective areas or reflective-to-non-reflective or non-reflective-to-reflective transitions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.