Patent US4363647A successfully refreshed from Google Patents.
US4363647A
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Method of making fused silica-containing material
Assignee: Corning Glass Works
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Filing: 1981-05-14
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Granted: 1982-12-14
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Expires: 2001-05-14
Abstract
Abstract This invention is directed to the production of fused silica-containing glass articles of large cross section or diameter wherein at least a surface layer thereof exhibits very high optical quality. The method involves depositing via flame hydrolysis/oxidation reaction a layer of fused silica-containing soot onto a supporting bait, essentially immediately thereafter applying a source of heat concentrated uniformly across the breadth of the soot deposit, but focused only over a relatively small area thereof, to raise the temperature within that area sufficiently to uniformly consolidate the soot in that area into a non-porous glass, and then cooling the glass to room temperature.
Inventors
- 👤 David L. Bachman
- 👤 William C. Lewis, Jr.
- 👤 Peter C. Schultz
- 👤 Francis W. Voorhees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:58
CPC Classifications
C; C03; C03B; C03B19/00; C03B19/14; C03B19/1484; C03B19/1492; C03B19/1415; C03B19/1423; C03B2201/00; C03B2201/02; C03B2201/06; C03B2201/08; C03B2201/10; C03B2201/20; C03B2201/28; C03B2201/30; C03B2201/31; C03B2201/32; C03B2201/40; C03B2201/42; C03B2207/00; C03B2207/50; C03B2207/52; C03B2207/54; C03B2207/60; C03B2207/66
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A method for preparing a fused silica-containing glass article of very high optical quality and having a large cross section or diameter, which comprises the steps of: (a) depositing via flame hydrolysis/oxidation reaction a layer of fused silica-containing soot upon a supporting bait; (b) essentially immediately thereafter applying a source of heat concentrated uniformly across the breadth of the soot deposit, but focused only over a relatively small area thereof, to raise the temperature thereof sufficiently to uniformly consolidate said small area of soot deposited into an essentially non-porous glass; and then (c) cooling said glass to room temperature.
Claim 2
Independent Claim
99 words
A method for preparing a fused silica-containing glass article of very high optical quality and having a large cross section or diameter, which comprises the steps of: (a) depositing via flame hydrolysis/oxidation reaction a layer of fused silica-containing soot upon a supporting bait; (b) essentially immediately thereafter applying a source of heat concentrated uniformly across the breadth of the soot deposit, but focused only over a relatively small area thereof, to raise the temperature thereof sufficiently to uniformly consolidate said small area of soot deposited into an essentially non-porous glass; and then (c) cooling said glass to room temperature.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein said fused silica-containing glass is high purity fused silica.
Claim 4
Dependent Claim
33 words
A method according to claim 1 wherein said fused silica-containing glass includes TiO 2 and/or Al 2 O 3 and/or B 2 O 3 and/or GeO 2 and/or P 2 O 5 .
Claim 5
Dependent Claim
39 words
A method according to claim 3 wherein said fused silica-containing glass includes up to 10% TiO 2 and/or up to 15% Al 2 O 3 and/or B 2 O 3 and/or GeO 2 and/or P 2 O 5 .
Claim 6
Independent Claim
114 words
A method for preparing a fused silica-containing glass article of very high optical quality and having a large cross section or diameter, which comprises the steps of: PG,21 (a) depositing via flame hydrolysis/oxidation reaction a layer of fused silica-containing soot upon a supporting bait of fused silica-containing glass; (b) essentially immediately thereafter applying a source of heat concentrated uniformly across the breadth of the soot deposit, but focused only over a relatively small area thereof, to raise the temperature thereof sufficiently to uniformly consolidate said small area of soot deposit into an essentially non-porous glass and integrally bond said glass to said supporting bait glass; and then (c) cooling the body to room temperature.
Claim 7
Independent Claim
114 words
A method for preparing a fused silica-containing glass article of very high optical quality and having a large cross section or diameter, which comprises the steps of: PG,21 (a) depositing via flame hydrolysis/oxidation reaction a layer of fused silica-containing soot upon a supporting bait of fused silica-containing glass; (b) essentially immediately thereafter applying a source of heat concentrated uniformly across the breadth of the soot deposit, but focused only over a relatively small area thereof, to raise the temperature thereof sufficiently to uniformly consolidate said small area of soot deposit into an essentially non-porous glass and integrally bond said glass to said supporting bait glass; and then (c) cooling the body to room temperature.
Claim 8
Dependent Claim
17 words
A method according to claim 5 wherein said soot and said bait consist of high purity silica.
Claim 9
Dependent Claim
15 words
A method according to claim 6 wherein said bait is not of high optical quality.
Claim 10
Dependent Claim
56 words
A method according to claim 5 wherein the composition of said soot and said bait includes up to 15% total of the indicated oxides in the stated proportions of 0-10% TiO 2 , 0-15% Al 2 O 3 , 0-15% B 2 O 3 , 0-15% GeO 2 , and 0-15% P 2 O 5 .
Claim 11
Dependent Claim
15 words
A method according to claim 8 wherein said bait is not of high optical quality.
Claim 12
Dependent Claim
64 words
A method according to claim 5 wherein the composition of said bait consists of high purity silica and the composition of said soot includes up to 15% total of the indicated oxide in the stated proportion of 0-10% TiO 2 , 0-15% Al 2 0 3 , 0-15% B 2 O 3 , 0-15% GeO 2 , and 0-15% P 2 O 5 .
References Cited (Backward Citations)
US2272342A
Cited
US3620702A
Cited
US4042404A
Cited
US4045198A
Cited
JPS5390026A
Cited
US4230472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |