Information record stampers
US4262875A · kind A · utility
13Cited by
10References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1979 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Aug 17, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/81
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Video disc nickel stampers are coated with a very thin, e.g., 100-250 angstroms, non-grainy layer of chromium which imparts increased scratch resistance to carbon-filled polyvinylchloride resins during compression molding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.