Process for manufacturing shadow mask of Braun tube for color TV
US4271571A · kind A · utility
2Cited by
2References
3Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Oct 11, 1979 |
| Grant date | Jun 9, 1981 |
| Priority date | — |
| Expiry date | Oct 11, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/0273
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In process for manufacturing shadow mask of Braun tube for color TV comprising steps of subjecting strip of low carbon steel to cold rolling finish, forming holes in the rolled material, cutting it into individual flat masks, annealing each mask at elevated temperatures, conditioning the annealed mask and press-forming the mask into desired shape, the improvement residing in controlling the finish cold rolling reduction within the range between 10 and 35%, whereby the annealing temperature is reduced to 520.degree. to 750.degree. C. The process is applicable to steel strip material containing up to 0.10% by weight of carbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.