US4346176A
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Glass for optical fiber
Assignee: NTT Inc
•
Filing: 1981-01-14
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Granted: 1982-08-24
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Expires: 2001-01-14
Abstract
Abstract Glass for an optical fiber consists essentially of 10 to 64 mol % of at least one kind of fluoride selected from a first group consisting of CaF 2 , SrF 2 and BaF 2 ; 0.5 to 50 mol % of at least one kind of fluoride selected from a second group consisting of YF 3 and fluorides of lanthanide elements; and 30 to 65 mol % of AlF 3 .
Inventors
- 👤 Terutoshi Kanamori
- 👤 Toyotaka Manabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:36
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/041; C03C13/042; C03C3/00; C03C3/32; C03C3/325; C03C4/00; C03C4/10; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
Fluoride glass for an optical fiber having good transmittance with a low transmission loss in the infrared region consisting essentially of 10 to 64 mol % of at least one fluoride selected from a first group consisting of CaF 2 , SrF 2 and BaF 2 ; 0.5 to 50 mol% of at least one fluoride selected from a second group consisting of YF 3 and the fluorides of the lanthanide elements; and 30 to 65 mol % of AlF 3 .
Claim 2
Dependent Claim
82 words
Fluoride glass for an optical fiber having good transmittance with a low transmission loss in the infrared region consisting essentially of 10 to 64 mol % of at least one fluoride selected from a first group consisting of CaF 2 , SrF 2 and BaF 2 ; 0.5 to 50 mol% of at least one fluoride selected from a second group consisting of YF 3 and the fluorides of the lanthanide elements; and 30 to 65 mol % of AlF 3 .
Claim 3
Dependent Claim
66 words
Glass for an optical fiber according to claim 1 wherein CaF 2 selected from the first group is used in an amount of 10 mol % of 64 mol %; YF 3 selected from the second group is used in an amount of 0.5 mol % to 50 mol %; and AlF 3 is used in an amount of 35 mol % to 60 mol %.
Claim 4
Dependent Claim
77 words
Glass for an optical fiber according to claim 1 wherein CaF 2 and BaF 2 selected from the first group are used in amounts of 25 mol % of 13 mol % and 25 mol % to 12 mol %, respectively; YF 3 selected from the second group is used in an amount of 20 mol % to 10 mol %; and AlF 3 is used in an amount of 30 mol % to 65 mol %.
Claim 5
Dependent Claim
69 words
Glass for an optical fiber according to claim 1 wherein CaF 2 and SrF 2 selected from the first group are used in amounts of 30 mol % to 20 mol % and 20 mol % to 30 mol %, respectively; YF 3 selected from the second group is used in an amount of 10 mol %; and AlF 3 is used in an amount of 40 mol %.
Claim 6
Dependent Claim
62 words
Glass for an optical fiber according to claim 1 wherein SrF 2 selected from the first group is used in an amount of 50 mol % to 30 mol %; YF 3 selected from the second group is used in an amount of 10 mol % to 30 mol %; and AlF 3 is used in an amount of 40 mol %.
Claim 7
Dependent Claim
54 words
Glass for an optical fiber according to claim 1 wherein BaF 2 selected from the first group is used in an amount of 30 mol %; YF 3 selected from the second group is used in an amount of 10 mol %; and AlF 3 is used in an amount of 60 mol %.
Claim 8
Dependent Claim
61 words
Glass for an optical fiber according to claim 1 wherein SrF 2 and BaF 2 selected from the first group are used in amounts of 40 mol % and 10 mol %, respectively; YF 3 selected from the second group is used in an amount of 10 mol %; and AlF 3 is used in an amount of 40 mol %.
Claim 9
Dependent Claim
63 words
Glass for an optical fiber according to claim 1 wherein CaF 2 , SrF 2 and BaF 2 selected from the first group are used in amounts of 20, 20 and 10 mol %, respectively; YF 3 selected from the second group is used in an amount of 10 mol %; and AlF 3 is used in an amount of 40 mol %.
Claim 10
Dependent Claim
67 words
Glass for an optical fiber according to claim 1 wherein CaF 2 selected from the first group is used in an amount of 50 mol %; one compound selected from the group consisting of LaF 3 , GdF 3 and LuF 3 of the second group is used in an amount of 10 mol %; and AlF 3 is used in an amount of 40 mol %.
Claim 11
Dependent Claim
64 words
Glass for an optical fiber according to claim 1 wherein SrF 2 selected from the first group is used in an amount of 50 mol %; one compound selected from the group consisting of GdF 3 and LuF 3 of the second group is used in an amount of 10 mol %; and AlF 3 is used in an amount of 40 mol %.
Claim 12
Dependent Claim
76 words
Glass for an optical fiber according to claim 1 wherein CaF 2 , SrF 2 and BaF 2 selected from the first group are used in amounts of 20, 10 and 10 mol %, respectively YF 3 , LaF 3 , GdF 3 and LuF 3 selected from the second group are used in amounts of 9, 4, 4 and 3 mol % respectively; and AlF 3 is used in an amount of 40 mol %.
Claim 13
Dependent Claim
63 words
Glass for an optical fiber according to claim 1 wherein CaF 2 selected from the first group is used in an amount of 40 mol %; YF 3 , CeF 3 and NdF 3 selected from the second group are used in amounts of 10, 5 and 5 mol %, respectively; and AlF 3 is used in an amount of 40 mol %.
Claim 14
Dependent Claim
37 words
Glass for an optical fiber according to claim 1 consisting essentially of 20 mol % CaF 2 , 20 mol % BaF 2 , 15 mol %, YF 3 , and 45 mol % AlF 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |