High density record including carbon black particles purified by electrolysis
US4776935A · kind A · utility
2Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 1984 |
| Grant date | Oct 11, 1988 |
| Priority date | — |
| Expiry date | May 18, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/80
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A high density information record of the electrostatic capacitance type which comprises a record substrate on which signal information is recorded as geometric variations. The substrate is made of a vinyl chloride resin, and carbon black which is purified by electrolysis to remove impurities therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.