Method of introducing protective atmosphere gases into a glass forming chamber
US3970442A · kind A · utility
8Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1975 |
| Grant date | Jul 20, 1976 |
| Priority date | — |
| Expiry date | Jul 16, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B18/16
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A glass forming chamber in which glass is formed into a continuous sheet by floating it on the surface of molten metal is provided with a first protective atmosphere gas in an enclosed shell above a refractory roof in the chamber and with a second protective atmosphere gas in the headspace of the operating portion of the chamber in the vicinity of the glass being formed. The second protective atmosphere gas is more reducing than the first. For example, the first protective atmosphere gas may be nitrogen while the second protective atmosphere gas is a mixture of nitrogen and hydrogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.