US2002037797A1PendingUtilityA1

Fluorine-containing glass

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Assignee: SUMITOMO ELECTRIC INDUSTRIESPriority: Aug 4, 2000Filed: Aug 3, 2001Published: Mar 28, 2002
Est. expiryAug 4, 2020(expired)· nominal 20-yr term from priority
Inventors:Yuichi OhgaTadashi Enomoto
C03C 23/0025C03B 19/1423C03B 19/1453C03B 2201/07C03B 2201/075C03B 2201/12C03B 2207/30C03B 2207/32C03B 2207/36C03B 2207/70C03C 3/06C03C 2201/11C03C 2201/12C03C 2201/23C03C 2203/54
43
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Claims

Abstract

Fluorine-containing glass which comprises silica and contains, in said silica, not more than 10 ppm of OH group, not more than 10 ppm of Cl and not less than 1000 ppm of F, said fluorine-containing glass having a concentration ratio of F/Cl of 100 or more. Also disclosed is fluorine-containing glass which contains not more than 10 ppm of OH group, not more than 10 ppm of Cl and not less than 1000 ppm of F, and has a concentration ratio of F/Cl of 1000 or more.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . Fluorine-containing glass which comprises silica and contains, in said silica, not more than 10 ppm of OH group, not more than 10 ppm of Cl and not less than 1000 ppm of F, said fluorine-containing glass having a concentration ratio of F/Cl of 100 or more.  
     
     
         2 . Fluorine-containing glass which contains not more than 10 ppm of OH group, not more than 10 ppm of Cl and not less than 1000 ppm of F, and has a concentration ratio of F/Cl of 1000 or more.  
     
     
         3 . Fluorine-containing glass which contains not more than 10 ppm of OH group, not more than 1 ppm of Cl and not less than 1000 ppm of F, and has a concentration ratio of F/Cl of 10000 or more.

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