US4145456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing internally coated glass tubes for the drawing of fibre optic light conductors
Assignee: Plasma Optical Fibre BV
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Filing: 1977-11-16
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Granted: 1979-03-20
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Expires: 1997-11-16
Abstract
Abstract In the reactive deposition of the core material from a gas which is passed through the tube onto the inner wall of the tube by means of a plasma zone, while a relative motion is effected in the axial direction between the tube and a plasma-producing device, the rate of precipitation is increased without impairing the quality of the core material coat, the reactive deposition being effected at a pressure of from 1 to 100 Torr and a temperature zone being superimposed on the plasma zone.
Inventors
- 👤 Dieter Kuppers
- 👤 Hans Lydtin
- 👤 Ludwig Rehder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:16
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/018; C03B37/01807; C03B37/01815; C03B37/01823; C03B37/0183
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A method of producing internally coated glass tubes for drawing fiber optic light conductors which consists of a core and a jacket of glasses which have a mutually different refractive index, comprising the steps of introducing into a glass tube surrounded by a resonator a reactive gas mixture consisting of SiCl 4 and oxygen at a pressure of about 1 to 100 Torr, adding GeCl 4 to the gas mixture, moving the tube relative to the resonator to form a non-isothermal plasma zone within the tube, and heating the tube to a temperature between 800° C.-1200° C. to form a coating free of soot-like particles and consisting of a plurality of layers of SiO 2 doped with an increasing content of GeO 2 .
Claim 2
Independent Claim
124 words
A method of producing internally coated glass tubes for drawing fiber optic light conductors which consists of a core and a jacket of glasses which have a mutually different refractive index, comprising the steps of introducing into a glass tube surrounded by a resonator a reactive gas mixture consisting of SiCl 4 and oxygen at a pressure of about 1 to 100 Torr, adding GeCl 4 to the gas mixture, moving the tube relative to the resonator to form a non-isothermal plasma zone within the tube, and heating the tube to a temperature between 800° C.-1200° C. to form a coating free of soot-like particles and consisting of a plurality of layers of SiO 2 doped with an increasing content of GeO 2 .
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1 wherein the gas mixture consists of about 96% by volume of oxygen and 4% by volume of SiCl 4 .
Claim 4
Dependent Claim
26 words
A method as claimed in claim 2 wherein up to 0.4% by volume of germanium tetrachloride (GeCl 4 ) is added to the reactive gas mixture.
References Cited (Backward Citations)
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US3484276A
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US3711262A
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US3934061A
Cited
US3938974A
Cited
US3957474A
Cited
US3932162A
Cited
US4011006A
Cited
US3961926A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |