US5246475A
Expired / Lapsed
US
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Method for preparing a fused silica glass body co-doped with a rare earth element and aluminum
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1992-03-26
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Granted: 1993-09-21
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Expires: 2012-03-26
Abstract
Abstract A novel method is proposed for the preparation of a transparent fused silica glass body co-doped with a rare earth element and aluminum each in a high uniformity of the dopant distribution. The method comprises the steps of: (a) flame-hydrolyzing a silicon compound and an aluminum compound in an oxyhydrogen flame to form a porous silicon oxide body containing aluminum; (b) soaking the porous body having a specified bulk density with a solution of a rare earth compound; (c) drying the solution-soaked porous body; and (d) sintering and vitrifying the dried porous body into a transparent glass body.
Inventors
- 👤 Noboru Edagawa
- 👤 Yoshihiro Yoshida
- 👤 Minoru Taya
- 👤 Tadakatsi Shimada
- 👤 Kazuo Koya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:08
CPC Classifications
C; C03; C03C; C03C23/00; C03C23/0095; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/01413; C03B37/01433; C03C3/00; C03C3/04; C03C3/06; C03B2201/00; C03B2201/06; C03B2201/30; C03B2201/34; C03B2201/36; C03B2207/00; C03B2207/80; C03B2207/90; C03C2201/00; C03C2201/06; C03C2201/30; C03C2201/31; C03C2201/34; C03C2201/3423; C03C2201/3435; C03C2201/3447; C03C2201/3476; C03C2201/36; C03C2203/00; C03C2203/40; C03C2203/42; C03C2203/44; Y; Y10; Y10S; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
169 words
A method for the preparation of a fused silica glass body co-doped with a rare earth element and aluminum which comprises the successive steps of: (a) introducing a silicon compound in the form of vapor and an aluminum compound in the form of vapor into an oxyhydrogen flame to effect co-pyrolysis of the silicon and aluminum compounds into their respective oxides in the form of particles which are deposited on a substrate in the form of a porous silicon oxide body containing aluminum oxide; (b) soaking the porous body of silicon oxide containing aluminum oxide with a solution of a compound of a rare earth element in a solvent to impregnate the porous body; (c) drying the porous body of silicon oxide impregnated with the solution; and (d) heating the dried porous body of silicon oxide containing aluminum oxide and the rare earth compound at an elevated temperature to effect sintering and vitrification thereof into a transparent fused silica glass body co-doped with the rare earth element and aluminum.
Claim 2
Independent Claim
169 words
A method for the preparation of a fused silica glass body co-doped with a rare earth element and aluminum which comprises the successive steps of: (a) introducing a silicon compound in the form of vapor and an aluminum compound in the form of vapor into an oxyhydrogen flame to effect co-pyrolysis of the silicon and aluminum compounds into their respective oxides in the form of particles which are deposited on a substrate in the form of a porous silicon oxide body containing aluminum oxide; (b) soaking the porous body of silicon oxide containing aluminum oxide with a solution of a compound of a rare earth element in a solvent to impregnate the porous body; (c) drying the porous body of silicon oxide impregnated with the solution; and (d) heating the dried porous body of silicon oxide containing aluminum oxide and the rare earth compound at an elevated temperature to effect sintering and vitrification thereof into a transparent fused silica glass body co-doped with the rare earth element and aluminum.
Claim 3
Dependent Claim
35 words
The method for the preparation of a fused silica glass body co-doped with a rare earth element and aluminum as claimed in claim 1 in which the aluminum compound in step (a) is aluminum chloride.
Claim 4
Dependent Claim
44 words
The method for the preparation of a fused silica glass body co-doped with a rare earth element and aluminum as claimed in claim 1 in which the compound of a rare earth element is a chloride, nitrate or sulfate of the rare earth element.
Claim 5
Dependent Claim
35 words
The method for the preparation of a fused silica glass body co-doped with a rare earth element and aluminum as claimed in claim 3 in which the solvent in the solution is an organic solvent.
Claim 6
Dependent Claim
35 words
The method for the preparation of a fused silica glass body co-doped with a rare earth element and aluminum as claimed in claim 4 in which the organic solvent is methyl alcohol or ethyl alcohol.
Claim 7
Dependent Claim
58 words
The method for the preparation of a fused silica glass body co-doped with a rare earth element and aluminum as claimed in claim 1 in which the porous body of silicon oxide containing aluminum oxide prior to soaking with the solution in step (b) has a bulk density in the range from 0.3 to 1.0 g/cm 3 .
Claim 8
Dependent Claim
65 words
The method for the preparation of a fused silica glass body co-doped with a rare earth element and aluminum as claimed in claim 1 in which the porous body of silicon oxide containing aluminum oxide obtained in step (a) is subjected, prior to step (b), to partial sintering so as to have a bulk density in the range from 0.3 to 1.0 g/cm 3 .
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) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |