US3859073A
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: 1975-01-07
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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 which is impregnated, in part at least, with a dopant which may be dissolved or suspended in a vehicle. The body is then thermally consolidated with the dopant dispersed therein.
Inventors
- 👤 Peter C Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:38
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/01413; C03B37/01433; C03C; C03C23/00; C03C23/0095; C03C3/00; C03C3/04; C03C3/06; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/10; C03B2201/20; C03B2201/28; C03B2201/30; C03B2201/31; C03B2201/34; C03B2201/36; C03B2201/40; C03B2201/42; C03C2201/00; C03C2201/06; C03C2201/30; C03C2201/34; C03C2201/40; C03C2201/42; C03C2203/00; C03C2203/40; C03C2203/42; C03C2203/44; C03C2203/50
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
197 words
A METHOD OF INCORPORATING AN OXIDE ADDITIVE INTO A GLASS BODY PRODUCED BY FLAME HYDROYLSIS WHICH COMPRISES PASSING ONE OR MORE HYDROLYZABLE COMPOUNDS OF SI02, GE02, B203, P2O5,SEO2, AND TEO2 IN VAPOR FORM INTO A FLAME TO PRODUCE THE CORRESPONDING OXIDES IN PARTICULATE FORM BY HYDROLYSIS OF SAID COMPOUNDS, DEPOSITING THE OXIDE PARTICLES ON A SUPPORT AS AN INTEGRAL PREFORM HAVING A NETWORK OF CONTINUOUS OPEN PORES THROUGHOUT ITS MASS AND BEING SUFFICIENTLY COHESIVE TO RESIST DISINTEGRATION DURING LIQUID IMMERSION, SAID POROSITY BEING BETWEEN ABOUT 60-90 PERCENT AND SAID PORES HAVING A DIAMETER RANGING BETWEEN ABOUT 0.001-10 MICRONS, FILLING AT LEAST A PORTION OF THE PORES IN THE PREFORM WITH A DOPANT MATERIAL IN LIQUID FORM THAT CONTAINS THE DESIRED OXIDE ADDITIVE, OR A COMPOUND CONVERTIBLE THERETO, SAID LIQUID FORM BEING A SOLUTION, A COLLOIDAL SOLUTION, A SUSPENSION, OR A COMPOUND IN THE MOLTEN STATE AND THAT IS SUBSTANTIALLY CHEMICALLY INERT WITH RESPECT TO THE PREFORM, DEPOSITING SAID MATERIAL AS A SOLID IN SAID PORES, AND 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
197 words
A METHOD OF INCORPORATING AN OXIDE ADDITIVE INTO A GLASS BODY PRODUCED BY FLAME HYDROYLSIS WHICH COMPRISES PASSING ONE OR MORE HYDROLYZABLE COMPOUNDS OF SI02, GE02, B203, P2O5,SEO2, AND TEO2 IN VAPOR FORM INTO A FLAME TO PRODUCE THE CORRESPONDING OXIDES IN PARTICULATE FORM BY HYDROLYSIS OF SAID COMPOUNDS, DEPOSITING THE OXIDE PARTICLES ON A SUPPORT AS AN INTEGRAL PREFORM HAVING A NETWORK OF CONTINUOUS OPEN PORES THROUGHOUT ITS MASS AND BEING SUFFICIENTLY COHESIVE TO RESIST DISINTEGRATION DURING LIQUID IMMERSION, SAID POROSITY BEING BETWEEN ABOUT 60-90 PERCENT AND SAID PORES HAVING A DIAMETER RANGING BETWEEN ABOUT 0.001-10 MICRONS, FILLING AT LEAST A PORTION OF THE PORES IN THE PREFORM WITH A DOPANT MATERIAL IN LIQUID FORM THAT CONTAINS THE DESIRED OXIDE ADDITIVE, OR A COMPOUND CONVERTIBLE THERETO, SAID LIQUID FORM BEING A SOLUTION, A COLLOIDAL SOLUTION, A SUSPENSION, OR A COMPOUND IN THE MOLTEN STATE AND THAT IS SUBSTANTIALLY CHEMICALLY INERT WITH RESPECT TO THE PREFORM, DEPOSITING SAID MATERIAL AS A SOLID IN SAID PORES, AND 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 compound passed into the flame is a volatile compound of silicon and a preform composed of silica is formed.
Claim 4
Dependent Claim
21 words
A method in accordance with claim 2 wherein the silica preform is impregnated with an alcohol solution of a metal salt.
Claim 5
Dependent Claim
14 words
A method in accordance with claim 3 wherein the metal salt is a chloride.
Claim 6
Dependent Claim
19 words
A method in accordance with claim 1 wherein said porous preform also contains TiO2, A12O3, ZrO2, or mixtures thereof.
Claim 7
Dependent Claim
23 words
A method in accordance with claim 1 wherein the dopant is suspended in a vehicle and the vehicle is evaporated before heat treatment.
Claim 8
Dependent Claim
17 words
A method in accordance with claim 1 wherein the dopant is dissolved in a volatile organic liquid.
Claim 9
Dependent Claim
14 words
A method in accordance with claim 1 wherein the dopant is dissolved in water.
Claim 10
Dependent Claim
17 words
A method in accordance with claim 1 wherein the filling material contains a plurality of different additives.
Claim 11
Dependent Claim
30 words
A method in accordance with claim 1 wherein the additive oxide is introduced by immersing the preform in a liquid bath containing the additive oxide or a material convertible thereto.
Claim 12
Dependent Claim
28 words
A method in accordance with claim 1 wherein the oxide particles are so deposited as to produce a differential in pore size in different portions of the preform.
Claim 13
Dependent Claim
14 words
A method in accordance with claim 11 wherein the differential is a continuous gradient.
Claim 14
Dependent Claim
18 words
A method in accordance with claim 1 wherein only a portion of the preform is filled with additive.
Claim 15
Dependent Claim
15 words
A method in accordance with claim 13 wherein the portion filled is a surface layer.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |