US4099834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low loss glass suitable for optical fiber
Assignee: Schott AG
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Filing: 1974-11-25
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Granted: 1978-07-11
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Expires: 1994-11-25
Abstract
Abstract A glass when in the form of an optical fiber having an optical loss of not more than 150 dB/km, high transparency, a high numerical aperture, and a high flexural strength, said glass being especially suitable for optical fibers and consisting essentially of: SiO 2 : 65 - 75 mol-%; (38 - 46% by weight); R 2 o: 4 - 17 mol-%; (4 - 13% by weight); PbO: 16 - 25 mol-%; (42 - 55% by weight); wherein R 2 O is Na 2 O, K 2 O or Cs 2 O or mixtures thereof, preferably not more than 3.0 mol % Na 2 O, and with the provision that the molar ratio of SiO 2 : PbO is 2.5 - 4.0.
Inventors
- 👤 Marga Faulstich
- 👤 Norbert Neuroth
- 👤 Franz Reitmayer
- 👤 Georg Krolla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:16
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C13/00; C03C13/04; C03C13/045; C03C13/046; C03C3/076; C03C3/102
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
100 words
An optical fiber having an optical loss of not more than 150 dB/km, high transparency, and a high flexural strength, said optical fiber comprising a sheath and core, at least one of said sheath and core being a glass of a composition consisting essentially of: SiO 2 : 65-75 mol-% (38-46% by weight); R 2 o: 4-17 mol-% (4-13% by weight); PbO: 16-25 mol-% (42-55% by weight); wherein R 2 O is Na 2 O, K 2 O or Cs 2 O or mixtures thereof and with the provision that the molar ratio of SiO 2 : PbO is 2.5-4.0.
Claim 2
Dependent Claim
100 words
An optical fiber having an optical loss of not more than 150 dB/km, high transparency, and a high flexural strength, said optical fiber comprising a sheath and core, at least one of said sheath and core being a glass of a composition consisting essentially of: SiO 2 : 65-75 mol-% (38-46% by weight); R 2 o: 4-17 mol-% (4-13% by weight); PbO: 16-25 mol-% (42-55% by weight); wherein R 2 O is Na 2 O, K 2 O or Cs 2 O or mixtures thereof and with the provision that the molar ratio of SiO 2 : PbO is 2.5-4.0.
Claim 3
Dependent Claim
53 words
An optical fiber according to claim 1 having an optical loss of not more than about 80 dB/km, said composition consisting essentially of: SiO 2 : 65-75 mol-% (38-48% by weight); K 2 o: 4-17 mol-% (4-13% by weight); Cs 2 O: 0-5 mol-% (0-10% by weight); PbO: 16-25 mol-% (42-55% by weight).
Claim 4
Dependent Claim
16 words
An optical fiber according to claim 2, said composition containing 4-12 molar percent K 2 O.
Claim 5
Dependent Claim
17 words
An optical fiber according to claim 3, said composition containing less than 1 p.p.m. of metal contaminants.
Claim 6
Dependent Claim
17 words
An optical fiber according to claim 2, said composition containing less than 10 p.p.m. H 2 O.
Claim 7
Dependent Claim
17 words
An optical fiber according to claim 5, said composition containing less than 1 p.p.m. of metal contaminants.
Claim 8
Dependent Claim
17 words
An optical fiber according to claim 2, said composition containing less than 1 p.p.m. of metal contaminants.
Claim 9
Dependent Claim
37 words
An optical fiber according to claim 7 wherein both the sheath and the core have a composition according to claim 7, but wherein the composition of the sheath and core differ and the refractive indices thereof differ.
Claim 10
Dependent Claim
42 words
An optical fiber according to claim 1, said composition consisting essentially of: SiO 2 : 70.5 mol-% (43.8% by weight); K 2 o: 9.0 mol-% (8.8% by weight); PbO: 20.5 mol-% (47.4% by weight); the molar ratio SiO 2 /PbO being 3.45.
Claim 11
Dependent Claim
17 words
An optical fiber according to claim 9, said composition containing less than 1 p.p.m. of metal contaminants.
Claim 12
Dependent Claim
42 words
An optical fiber according to claim 1, said composition consisting essentially of: SiO 2 : 69.40 mol-% (41.76% by weights); K 2 o: 7.87 mol-% (7.43% by weight); PbO: 22.72 mol-% (50.81% by weight); the molar ratio SiO 2 /PbO being 3.06.
Claim 13
Dependent Claim
23 words
An optical fiber according to claim 1 with the provision that the H 2 O content of said composition is < 10 p.p.m.
Claim 14
Dependent Claim
17 words
An optical fiber according to claim 12, said composition containing less than 1 p.p.m. of metal contaminants.
Claim 15
Dependent Claim
19 words
An optical fiber according to claim 1, said glass having an optical loss of not more than 20 dB/km.
Claim 16
Dependent Claim
37 words
An optical fiber according to claim 1, wherein both the sheath and the core have said composition according to claim 1, but wherein the composition of the sheath and core differ and the refractive indices thereof differ.
Claim 17
Dependent Claim
44 words
In a process of transmitting information through an optical waveguide comprising sending modulated light into one end of the waveguide and detecting the light at the other end of the waveguide, the improvement wherein said waveguide is an optical fiber according to claim 15.
Claim 18
Dependent Claim
44 words
In a process of transmitting information through an optical waveguide comprising sending modulated light into one end of the waveguide and detecting the light at the other end of the waveguide, the improvement wherein said waveguide is an optical fiber according to claim 1.
Claim 19
Dependent Claim
19 words
An optical fiber according to claim 1 said composition having not more than 3.0 molar percent Na 2 O.
Claim 20
Dependent Claim
17 words
An optical fiber according to claim 18, said composition containing less than 1 p.p.m. of metal contaminants.
Claim 21
Dependent Claim
17 words
An optical fiber according to claim 1, said composition containing less than 1 p.p.m. of metal contaminants.
Claim 22
Dependent Claim
37 words
An optical fiber according to claim 6 wherein both the sheath and the core have a composition according to claim 20, but wherein the composition of the sheath and core differ and the refractive indices thereof differ.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |