Method for the improvement of gramophone records
US4302307A · kind A · utility
1Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1979 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Jul 25, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Gramophone records made of a vinyl chloride based resin are subjected to a treatment with low temperature plasma of a gas having no polymerizability in the plasma condition. A markedly improved anti-static effect is imparted to the surface of the gramophone record which also becomes highly resistant to wearing so that the signal/noise ratio in playing of the gramophone record is remarkably improved even after many times of repeated playing of the record.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.