Patent US3431958A successfully refreshed from Google Patents.
US4094689A
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Glass compositions
Assignee: US Philips Corp
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Filing: 1977-03-16
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Granted: 1978-06-13
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Expires: 1997-03-16
Abstract
Abstract Glass composition pairs which are suitable for processing into fibers with a gradient refractive index profile for use in telecommunication. They consist of GeO 2 B 2 O 3 /SiO 2 , alkali oxide which in one composition consists of Li 2 O and/or Na 2 O and in the other composition of Na 2 O and/or K 2 O and other compatible oxides.
Inventors
- 👤 Henricus Matheus Jacobus Marie van Ass
- 👤 Robert Georg Gossink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:44
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/028; G02B6/0281; C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C13/048; C03C3/00; C03C3/04; C03C3/062; C03C3/064
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A glass composition suitable for processing into optical fibers with a radial gradient in the refractive index, consisting essentially of GeO 2 , at least one oxide chosen from B 2 O 3 and SiO 2 , an alkali oxide selected from the group consisting of Li 2 O, Na 2 O, K 2 O, wherein GeO.sub.2 ≧ 25 mole % SiO 2 + B 2 O 3 ≧ 25 mole % and a totality of alkali oxide ≧ 15 mole %.
Claim 2
Dependent Claim
82 words
A glass composition suitable for processing into optical fibers with a radial gradient in the refractive index, consisting essentially of GeO 2 , at least one oxide chosen from B 2 O 3 and SiO 2 , an alkali oxide selected from the group consisting of Li 2 O, Na 2 O, K 2 O, wherein GeO.sub.2 ≧ 25 mole % SiO 2 + B 2 O 3 ≧ 25 mole % and a totality of alkali oxide ≧ 15 mole %.
Claim 3
Dependent Claim
90 words
Optical fibers with a radial gradient in the refractive index wherein a core having the highest refractive index and a cladding having the lowest refractive index have a continuous transition zone, obtained from a pair of glass compositions according to claim 1 in which the alkali metal oxide of the core is Li 2 O and/or Na 2 O and the alkali metal oxide of the cladding is Na 2 O and/or K 2 O, the alkali metal in the cladding being other than the alkali metal in the core.
Claim 4
Dependent Claim
16 words
A multi-fiber optical cable which comprises a plurality of optical fibers as claimed in claim 2.
References Cited (Backward Citations)
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US3758284A
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US3884550A
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US3859103A
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US4011006A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |