Patent US4314833A successfully refreshed from Google Patents.
US4314833A
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Method of producing optical fibers
Assignee: Plasma Optical Fibre BV
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Filing: 1980-07-16
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Granted: 1982-02-09
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Expires: 2000-07-16
Abstract
Abstract Doped silica glass is deposited by means of reactive deposition from the gas phase by the action of a nonisothermal plasma, on the inside of a quartz glass tube. The coated tube is collapsed and the preform thus obtained is drawn into an optical fiber. During the deposition procedure the tube inside diameter between 6 and 30 mm must satisfy the formula (M/A.sub.I) 1/3.58×1 mm≦d wherein M is the deposition rate of doped quartz glass in grams per minute and A I has the value 1.42×10 -4 g/min. At the end of the deposition, prior to collapsing, the inside diameter must satisfy the equation (M/A.sub.II) 1/3.04×1 mm≧d A II having the value 6.63×10 -5 g/min.
Inventors
- 👤 Dieter Kuppers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:28
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/018; C03B37/01861; C03B37/01807; C03B37/01815; C03B37/01823; C03B37/0183
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A method of producing optical fibers comprising the steps of: providing a silica glass tube; depositing a coating of silica glass, with or without a dopant, on the interior of the tube, said deposition being achieved by introducing a reactive gas mixture of glass-forming compounds into the tube and forming a nonisothermal plasma within the tube; collapsing the coated tube; and drawing the glass tube into a fiber; CHARACTERIZED IN THAT during the deposition step M/(A.sub.I ×3.58)×1 mm≦d, where M is the instantaneous deposition rate in grams per minute, d is the inside diameter of the tube at the time of deposition and A I equals 1.42×10 -4 grams per minute.
Claim 2
Independent Claim
111 words
A method of producing optical fibers comprising the steps of: providing a silica glass tube; depositing a coating of silica glass, with or without a dopant, on the interior of the tube, said deposition being achieved by introducing a reactive gas mixture of glass-forming compounds into the tube and forming a nonisothermal plasma within the tube; collapsing the coated tube; and drawing the glass tube into a fiber; CHARACTERIZED IN THAT during the deposition step M/(A.sub.I ×3.58)×1 mm≦d, where M is the instantaneous deposition rate in grams per minute, d is the inside diameter of the tube at the time of deposition and A I equals 1.42×10 -4 grams per minute.
Claim 3
Dependent Claim
29 words
A method as claim in claim 1, CHARACTERIZED IN THAT at the end of the deposition step M/(A.sub.II ×3.04)×1 mm≧d where A II equals 6.63×10 -5 /grams per minute.
Claim 4
Dependent Claim
13 words
A method as claimed in claim 2, CHARACTERIZED IN THAT 6 mm≦d≦30 mm.
Claim 5
Independent Claim
87 words
A method of producing internally coated glass tubes by depositing a coating of glass layers on the interior to the tube, said method comprising the steps of: introducing a reactive gas mixture into the tube; and forming a nonisothermal plasma zone within a portion of the tube; CHARACTERIZED IN THAT the deposition rate, M, in grams per minute is less than or equal to the product of 5.0836 times 10 -4 grams/minute-millimeter times the inside diameter of the tube, d, in millimeters at the time of deposition.
Claim 6
Independent Claim
87 words
A method of producing internally coated glass tubes by depositing a coating of glass layers on the interior to the tube, said method comprising the steps of: introducing a reactive gas mixture into the tube; and forming a nonisothermal plasma zone within a portion of the tube; CHARACTERIZED IN THAT the deposition rate, M, in grams per minute is less than or equal to the product of 5.0836 times 10 -4 grams/minute-millimeter times the inside diameter of the tube, d, in millimeters at the time of deposition.
Claim 7
Dependent Claim
52 words
A method as claimed in claim 4, CHARACTERIZED IN THAT at the end of the deposition the deposition rate, M, in grams per minute is greater than or equal to the product of 2.01552×10 -4 grams/minute-millimeter times the inside diameter of the tube, d, in millimeters at the end of the deposition.
Claim 8
Independent Claim
19 words
A method as claimed in claimed 5, CHARACTERIZED IN THAT the glass tube and the deposited layers comprise silica.
Claim 9
Dependent Claim
21 words
A method as claimed in claim 6, CHARACTERIZED IN THAT during deposition the tube is moved relative to the plasma zone.
Claim 10
Dependent Claim
34 words
A method of producing optical fibers comprising the steps of: producing an internally coated glass tube as claimed in claim 7; collapsing the coated glass tube; and drawing the collapsed tube into a fiber.
References Cited (Backward Citations)
US4145456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |