Method and apparatus for the manufacture of record stampers
US4522659A · kind A · utility
7Cited by
5References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 29, 1984 |
| Grant date | Jun 11, 1985 |
| Priority date | — |
| Expiry date | Mar 29, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/81
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved method and apparatus is provided for the manufacture of stampers in which the stampers are electroformed from a relatively hard metal in a flat configuration and then, either before or after shaping of the shaped inner and outer edges, but prior to the use in the pressing of records, the inner and/or outer edges are selectively annealed to increase the ductility of these portions while retaining hardness of the remainder of the stamper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.