Process for producing preforms for optical fibers
US5000773A · kind A · utility
9Cited by
6References
12Claims
0Family size
Inventors
Key dates
| Filing date | Oct 24, 1988 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Oct 24, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2203/24
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A hollow silica bar is formed on a mandrel by an external deposition method using a plasma torch. The mandrel is removed and on the inner face of the bar is deposited a vitreous coating to be used for the subsequent formation of the core of the fibers. Deposition is obtained by means of a plasma column, formed in the bar as a result of an ultra-high frequency coupler able to inject a travelling surface wave into the plasma column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.