Process for making video discs
US4354988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1980 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | Mar 4, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/811
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for making video discs by moulding from an engraved master which includes depositing on one edge of the master an elongated fillet of a curable resin; photopolymerizable or thermosetting and spreading gradually the resin between the master and a flexible film of a substrate which is applied by means of a pressure roller, the resin being then cured as required by ultra-violet or infrared radiation through the film. The process may also include piercing the central hole and cutting out the disc. The formation of a succession of discs on the same film may be made automatic, the film advancing step by step between each moulding and/or cutting out operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.