Patent US4474593A successfully refreshed from Google Patents.
US4474593A
Expired / Lapsed
US
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Method of fabricating a lightguide fiber
Assignee: AT&T Inc
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Filing: 1983-09-06
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Granted: 1984-10-02
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Expires: 2003-09-06
Abstract
Abstract A technique for fabricating a lightguide soot-boule. Gaseous reactants are directed through an inner tube of a torch having a plurality of coaxially aligned tubes. A glassy soot is formed at the output of the torch by a flame hydrolysis reaction and at least a portion of the soot is deposited on a forming soot-boule. The inner tube may be axially moved during the soot deposition process to alter or maintain the refractive index of the boule.
Inventors
- 👤 Matthew J. Andrejco
- 👤 Eugene Potkay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:44
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/01413; C03B2207/00; C03B2207/04; C03B2207/06; C03B2207/08; C03B2207/20; C03B2207/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
A method of fabricating a lightguide soot boule, comprising the steps of: directing gaseous reactants through an inner tube of a torch having a plurality of spaced, coaxially aligned tubes; forming soot at the output of the torch by a flame hydrolysis reaction; depositing at least a portion of said soot on a forming soot boule; and controllably altering or maintaining the refractive index of the soot boule by axially moving the inner tube during soot deposition.
Claim 2
Independent Claim
77 words
A method of fabricating a lightguide soot boule, comprising the steps of: directing gaseous reactants through an inner tube of a torch having a plurality of spaced, coaxially aligned tubes; forming soot at the output of the torch by a flame hydrolysis reaction; depositing at least a portion of said soot on a forming soot boule; and controllably altering or maintaining the refractive index of the soot boule by axially moving the inner tube during soot deposition.
Claim 3
Independent Claim
100 words
A method of fabricating a lightguide fiber, comprising the steps of: directing gaseous reactants through an inner tube of a torch having a plurality of spaced, coaxially aligned tubes; forming soot at the output of the torch by a flame hydrolysis reaction; depositing at least a portion of said soot on a forming soot boule; altering or maintaining the refractive index of the soot boule by axially moving the inner tube during soot deposition; consolidating the soot boule into a solid glass preform; heating at least a portion of the preform; and drawing a lightguide fiber from the heated preform.
Claim 4
Independent Claim
100 words
A method of fabricating a lightguide fiber, comprising the steps of: directing gaseous reactants through an inner tube of a torch having a plurality of spaced, coaxially aligned tubes; forming soot at the output of the torch by a flame hydrolysis reaction; depositing at least a portion of said soot on a forming soot boule; altering or maintaining the refractive index of the soot boule by axially moving the inner tube during soot deposition; consolidating the soot boule into a solid glass preform; heating at least a portion of the preform; and drawing a lightguide fiber from the heated preform.
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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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |