EP0103441A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for drying oxide glasses
Assignee: British Telecommunications PLC
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Filing: 1983-09-01
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Granted: —
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Expires: 2003-09-01
Abstract
Abstract An oxide glass is dried by passing through a melt of the glass fluorine or another perhalogenated compound including fluorine atoms. For example, C3F8 (e.g. after pre-cracking) can be used to reduce the OH content of a borosilicate glass, and the loss of an optical fibre drawn from such a glass, to low levels.
Inventors
- 👤 Keith John Beales
- 👤 Steve Fitzgerald Carter
- 👤 Sally Partington
- 👤 Paul William France
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 08:37
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/022; C03B37/023; C03B5/00; C03B5/16; C03B5/225; C03C3/00; Y; Y10; Y10S; Y10S65/00; Y10S65/15; Y10S65/16; Y10S65/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
A method for drying an oxide glass, which comprises passing a drying gas through the molten glass, characterised in that the gas is of a perhalogenated compound in which the halogen atoms include fluorine.
Claim 2
Independent Claim
34 words
A method for drying an oxide glass, which comprises passing a drying gas through the molten glass, characterised in that the gas is of a perhalogenated compound in which the halogen atoms include fluorine.
Claim 3
Dependent Claim
41 words
A method according to claim 1, in which a perhalogenated compound as defined in claim 1 is heated, prior to introduction into the molten glass, to reduce the amount of components in the gas which may be retained in the glass.
Claim 4
Dependent Claim
21 words
A method according to claim 1 or claim 2, in which the halogen atoms are selected only from fluorine and chlorine.
Claim 5
Dependent Claim
12 words
A method according to claim 3, in which the compound is perfluorinated.
Claim 6
Independent Claim
14 words
A method according to any preceding claim, in which the compound is a perhalocarbon.
Claim 7
Dependent Claim
17 words
A method according to claim 4, in which the perfluorinated compound is C 3 F S .
Claim 8
Dependent Claim
15 words
A method according to claim 1 or claim 2, in which the compound is fluorine.
Claim 9
Independent Claim
35 words
A method according to any preceding claim, in which a gas selected from CO and C0 2 is passed through the molten glass at the same time as, or prior to, the said perhalogenated compound.
Claim 10
Independent Claim
23 words
A method according to any preceding claim, in which 0 2 is passed through the molten glass prior to the said perhalogenated compound.
Claim 11
Independent Claim
19 words
A method according to any preceding claim, in which the glass is a borosilicate for use in optical fibres.
References Cited (Backward Citations)
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