US3864113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of Producing Glass by Flame Hydrolysis
Assignee: Corning Glass Works
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Filing: 1973-10-19
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Granted: 1975-02-04
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Expires: 1993-10-19
Abstract
Abstract A method of incorporating an additive or dopant oxide in a glass body produced by the flame hydrolysis technique. Particles of the primary glass former are produced by flame hydrolysis and deposited to form a porous body. This is impregnated with a vaporized dopant which condenses within the pores on cooling. The body is then thermally consolidated with the dopant dispersed therein.
Inventors
- 👤 Jr William H Dumbaugh
- 👤 Peter C Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/01446; C03B37/0146; C03C; C03C23/00; C03C23/0095; C03C3/00; C03C3/04; C03C3/06; C03B2201/00; C03B2201/06; C03B2201/30; C03B2201/32; C03C2201/00; C03C2201/06; C03C2201/30; C03C2201/32; C03C2203/00; C03C2203/40; C03C2203/42; C03C2203/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
179 words
A METHOD OF INCOPORATING AN OXIDE ADDITIVE INTO A GLASS BODY PRODUCT BY FLAME HYDROLYSIS WHICH COMPRISES PASSING A HYDROLYZABLE COMPOUND OF SIO2, B2O3, GEO2, P2O5, SEO2 TEO2, OR A MIXTURE THEREOF IN VAPOR FORM INTO A FLAME TO PRODUCE THE CORRESPONDING OXIDE IN PARTICULATE FORM BY HYDROLYSIS OF SAID COMPOUND, DEPOSITING THE OXIDE PARTICLES ON A SUPPORT AS AN INTEGRAL PREFORM HAVING A NETWORK OF CONTINUOUS OPEN PORES THROUGHOUT ITS MASS, SAID POROSITY BEING LESS THAN ABOUT 90 PERCENT AND SAID PORES HAVING A DIAMETER NOT LESS THAN ABOUT 0.001 MICRON, POSITIONING SAID PREFORM IN A HEATED ENCLOSED SPACE CONTAINING VAPORS OF AN OXIDE ADDITIVE, OR A COMPOUND CONVERTIBLE THERETO, WHICH THERMALLY VAPORIZE AT A TEMPERATURE BELOW THE CONSOLIDATION TEMPERATURE OF THE PREFORM, TO INTRODUCE SUCH VAPORS INTO THE PORES OF THE PREFORM, COOLING THE PREFORM IN THE SAID VAPORS TO CONDENSE THE VAPORS IN THE PORES, HEAT TREATING THE PREFORM TO CONSOLIDATE IT INTO A NON-POROUS GLASSY BODY COMPOSED OF THE OXIDE OF HYDROLYSIS CONTAINING THE ADDITIVE OXIDE DISPERSED THROUGHOUT AT LEAST A PORTION OF THE BODY.
Claim 2
Independent Claim
179 words
A METHOD OF INCOPORATING AN OXIDE ADDITIVE INTO A GLASS BODY PRODUCT BY FLAME HYDROLYSIS WHICH COMPRISES PASSING A HYDROLYZABLE COMPOUND OF SIO2, B2O3, GEO2, P2O5, SEO2 TEO2, OR A MIXTURE THEREOF IN VAPOR FORM INTO A FLAME TO PRODUCE THE CORRESPONDING OXIDE IN PARTICULATE FORM BY HYDROLYSIS OF SAID COMPOUND, DEPOSITING THE OXIDE PARTICLES ON A SUPPORT AS AN INTEGRAL PREFORM HAVING A NETWORK OF CONTINUOUS OPEN PORES THROUGHOUT ITS MASS, SAID POROSITY BEING LESS THAN ABOUT 90 PERCENT AND SAID PORES HAVING A DIAMETER NOT LESS THAN ABOUT 0.001 MICRON, POSITIONING SAID PREFORM IN A HEATED ENCLOSED SPACE CONTAINING VAPORS OF AN OXIDE ADDITIVE, OR A COMPOUND CONVERTIBLE THERETO, WHICH THERMALLY VAPORIZE AT A TEMPERATURE BELOW THE CONSOLIDATION TEMPERATURE OF THE PREFORM, TO INTRODUCE SUCH VAPORS INTO THE PORES OF THE PREFORM, COOLING THE PREFORM IN THE SAID VAPORS TO CONDENSE THE VAPORS IN THE PORES, HEAT TREATING THE PREFORM TO CONSOLIDATE IT INTO A NON-POROUS GLASSY BODY COMPOSED OF THE OXIDE OF HYDROLYSIS CONTAINING THE ADDITIVE OXIDE DISPERSED THROUGHOUT AT LEAST A PORTION OF THE BODY.
Claim 3
Dependent Claim
28 words
A method in accordance with claim 1 wherein the volatile compound passed into the flame is a compound of silicon and a preform composed of silica is formed.
Claim 4
Dependent Claim
29 words
A method in accordance with claim 1 wherein a mixture of volatile compounds is passed into a flame to form a mixture of the corresponding oxides in particulate form.
Claim 5
Dependent Claim
19 words
A method in accordance with claim 1 wherein said porous preform also contains TiO2, A12O3, ZrO2, or mixtures thereof.
Claim 6
Dependent Claim
33 words
A method in accordance with claim 1 wherein the preform is positioned in a heating chamber, the chamber is evacuated and sealed, and the chamber is then heated to vaporize the condensible additive.
Claim 7
Dependent Claim
29 words
A method in accordance with claim 5 wherein the chamber is heated to a temperature at which the vapor pressure of the condensible additive is approximately 760 mm. mercury.
Claim 8
Dependent Claim
24 words
A method in accordance with claim 1 wherein the preform is deposited under varying thermal conditions to vary pore size in the porous network.
Claim 9
Dependent Claim
18 words
A method in accordance with claim 1 wherein the preform is impregnated with a plurality of condensible vapors.
Claim 10
Dependent Claim
15 words
A method in accordance with claim 1 wherein the condensible vapor additive is a chloride.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |