Method of producing glass preform in furnace for heating glass
US5259856A · kind A · utility
29Cited by
7References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Jun 1, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S65/90
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A heating furnace for heating a porous preform made of fine particles of quartz base glass for an optical fiber which comprises a heater and a muffle tube positioned inside the heater to separate a heating atmosphere from the heater, wherein the muffle tube body consists of highly pure carbon and an inner wall and an outer wall of the body is coated with a carbon material selected from the group consisting of pyrolytic graphite and solid-phase carbonized glassy carbon.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.