Gramophone record
US9886969B2 · kind B2 · utility
0Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2016 |
| Grant date | Feb 6, 2018 |
| Priority date | — |
| Expiry date | Mar 22, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B3/682
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A gramophone record includes a main body and a cladding layer. The main body is made of a polymeric material, and has a base surface and an extending surface which extends downward from the base surface. The extending surface defines a continuous spiral groove in the main body. The cladding layer is formed on the extending surface, and has a Hardness Rockwell C (HRC) of not less than 37.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.