US4308066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass for optical fibers
Assignee: NTT Inc
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Filing: 1980-09-23
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Granted: 1981-12-29
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Expires: 2000-09-23
Abstract
Abstract Glass for optical fibers is made of material of a binary system containing a fluoride selected from BaF 2 , SrF 2 CaF 2 and PbF 2 and another fluoride selected from AlF 3 and ZrF 4 .
Inventors
- 👤 Seiko Mitachi
- 👤 Shuichi Shibata
- 👤 Terutoshi Kanamori
- 👤 Toyotaka Manabe
- 👤 Mitsuho Yasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:39
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/041; C03C13/042; C03C3/00; C03C3/32; C03C3/325; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
Glass for optical fibers made of material of binary system consisting essentially of more than 20 mol % and less than 80 mol % of a fluoride selected from a first group of BaF 2 , SrF 2 , CaF 2 and PbF 2 and more than 20 mol % and less than 80 mol % of another fluoride selected from a second group of AlF 3 and ZrF 4 .
Claim 2
Dependent Claim
71 words
Glass for optical fibers made of material of binary system consisting essentially of more than 20 mol % and less than 80 mol % of a fluoride selected from a first group of BaF 2 , SrF 2 , CaF 2 and PbF 2 and more than 20 mol % and less than 80 mol % of another fluoride selected from a second group of AlF 3 and ZrF 4 .
Claim 3
Dependent Claim
52 words
Glass for optical fibers according to claim 1, wherein BaF 2 is selected from the first group and is within the range of 78 mol % to 64 mol % and AlF 3 is selected from the second grouop and is within the range of 22 mol % to 36 mol %.
Claim 4
Dependent Claim
52 words
Glass for optical fibers according to claim 1, wherein SrF 2 is selected from the first group and is within the range of 74 mol % to 40 mol % and AlF 3 is selected from the second group and is within the range of 26 mol % to 60 mol %.
Claim 5
Dependent Claim
52 words
Glass for optical fibers according to claim 1, wherein CaF 2 is selected from the first group and is within the range of 72 mol % to 40 mol % and AlF 3 is selected from the second group and is within the range of 28 mol % to 60 mol %.
Claim 6
Dependent Claim
52 words
Glass for optical fibers according to claim 1, wherein BaF 2 is selected from the first group and is within the range of 68 mol % to 30 mol % and ZrF 4 is selected from the second group and is within the range of 32 mol % to 70 mol %.
Claim 7
Dependent Claim
52 words
Glass for optical fibers according to claim 1, wherein SrF 2 is selected from the first group and is within the range of 58 mol % to 30 mol % and ZrF 4 is selected from the second group and is within the range of 42 mol % to 70 mol %.
Claim 8
Dependent Claim
52 words
Glass for optical fibers according to claim 1, wherein CaF 2 is selected from the first group and is within the range of 56 mol % to 30 mol % and ZrF 4 is selected from the second group and is within the range of 44 mol % to 70 mol %.
Claim 9
Dependent Claim
52 words
Glass for optical fibers according to claim 1, wherein PbF 2 is selected from the first group and is within the range of 64 mol % to 35 mol % and ZrF 4 is selected from the second group and is within the range of 36 mol % to 65 mol %.
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) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |