Furnace for heating highly pure quartz preform for optical fiber
US5114338A · kind A · utility
15Cited by
0References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1991 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Mar 22, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2205/63
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A heating furnace for heating a porous preform made of fine particles of highly pure quartz glass for an optical fiber, which furnace comprises a cylindrical furnace body, a heater installed in said furnace body and a muffle tube installed inside said heater to separate a heating atmosphere from said heater, wherein said muffle tube is made of highly pure carbon and coated with a gas impermeable carbon, which furnace prevents contamination of the preform with impurities and has long life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.