High density information record medium using carbon black particles surface-treated with silicone oil
US4646284A · kind A · utility
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5References
5Claims
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Key dates
| Filing date | Sep 11, 1985 |
| Grant date | Feb 24, 1987 |
| Priority date | — |
| Expiry date | Sep 11, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B9/068
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
High density information signal recording media of an electrostatic capacitance type, in which an information signal is recorded as geometric variations. The medium consists of a conductive resin composition which comprises a vinyl chloride resin, carbon black particles and a silicone oil lubricant. The carbon black particles are treated with a silicone oil to have the oil coated thereon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.