US4042404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused P2 O5 type glasses
Assignee: Corning Glass Works
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Filing: 1976-04-12
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Granted: 1977-08-16
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Expires: 1996-04-12
Abstract
Abstract Fused oxide type glasses produced by flame hydrolysis are described. These glasses are composed of P 2 O 5 and, optionally, SiO 2 . P 2 O 5 is present in an amount of at least 2% by weight.
Inventors
- 👤 Peter C. Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:34
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/062; C03C3/097; C03C3/12; C03C3/16; C03C3/21; C03C3/253
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
212 words
A method for making a transparent fused oxide type glass exhibiting a refractive index between about 1.46-1.49 and a coefficient of thermal expansion (0°-300° C.) of about 5-40 × 10.sup. -7 /° C. consisting essentially, by weight, of 2-50% P 2 O 5 and the remainder SiO 2 , and having a cation impurity level not exceeding 10 PPM, which comprises the steps a. entraining a vaporizable compound capable of being converted by flame hydrolysis and decomposition to P 2 O 5 and a vaporizable compound capable of being converted by flame hydrolysis and decomposition to SiO 2 in a gas stream; b. passing said gas stream into the flame of a combustion burner to cause the interbonding of P 2 O 5 and SiO 2 into vitresous particles of fused P 2 O 5 --SiO 2 such that volatilization of P 2 O 5 and SiO 2 is limited; c. collecting said vitreous particles at a temperature below the minimum consolidation temperature as a porous preform body; and then d. heating said porous preform body to a temperature within the range of minimum consolidation temperature of said vitreous particles and 200° C. thereabove, but not in excess of 1450° C., to consolidate said porous preform body to a non-porous glass body.
Claim 2
Independent Claim
212 words
A method for making a transparent fused oxide type glass exhibiting a refractive index between about 1.46-1.49 and a coefficient of thermal expansion (0°-300° C.) of about 5-40 × 10.sup. -7 /° C. consisting essentially, by weight, of 2-50% P 2 O 5 and the remainder SiO 2 , and having a cation impurity level not exceeding 10 PPM, which comprises the steps a. entraining a vaporizable compound capable of being converted by flame hydrolysis and decomposition to P 2 O 5 and a vaporizable compound capable of being converted by flame hydrolysis and decomposition to SiO 2 in a gas stream; b. passing said gas stream into the flame of a combustion burner to cause the interbonding of P 2 O 5 and SiO 2 into vitresous particles of fused P 2 O 5 --SiO 2 such that volatilization of P 2 O 5 and SiO 2 is limited; c. collecting said vitreous particles at a temperature below the minimum consolidation temperature as a porous preform body; and then d. heating said porous preform body to a temperature within the range of minimum consolidation temperature of said vitreous particles and 200° C. thereabove, but not in excess of 1450° C., to consolidate said porous preform body to a non-porous glass body.
Claim 3
Dependent Claim
11 words
A fused oxide type glass produced in accordance with claim 1.
References Cited (Backward Citations)
US3849344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |