US4061487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing glass in a rotary furnace
Assignee: Praxair Technology Inc
•
Filing: 1976-12-16
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Granted: 1977-12-06
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Expires: 1996-12-16
Abstract
Abstract A continuous process for melting inorganic raw materials to produce molten glass in a generally cylindrical continuously rotating chamber comprising the following steps:
Inventors
- 👤 Kazuo Kiyonaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:16
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/14; C03B5/16; C03B5/235; C03B5/2353; Y; Y02; Y02P; Y02P40/00; Y02P40/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
152 words
A continuous process for melting inorganic raw materials to produce molten glass in a generally cylindrical continuously rotating chamber comprising the following steps: a. feeding the raw materials into the chamber; b. providing a flame of high intensity heat produced by the combustion of fuel with a gas containing about 50 to about 100 percent by volume oxygen and directing the flame into the chamber in such a manner that the raw materials are melted; and c. rotating said chamber at a sufficient speed and cooling the exterior of the chamber with a liquid coolant in such a manner that the inner surface of the chamber is coated with a layer of molten glass, the layer is solidified, and a solidified layer of glass is maintained throughout the process whereby the solidified layer essentially prevents impurities from the inner surface of the chamber from entering the melt; and d. withdrawing molten glass.
Claim 2
Dependent Claim
152 words
A continuous process for melting inorganic raw materials to produce molten glass in a generally cylindrical continuously rotating chamber comprising the following steps: a. feeding the raw materials into the chamber; b. providing a flame of high intensity heat produced by the combustion of fuel with a gas containing about 50 to about 100 percent by volume oxygen and directing the flame into the chamber in such a manner that the raw materials are melted; and c. rotating said chamber at a sufficient speed and cooling the exterior of the chamber with a liquid coolant in such a manner that the inner surface of the chamber is coated with a layer of molten glass, the layer is solidified, and a solidified layer of glass is maintained throughout the process whereby the solidified layer essentially prevents impurities from the inner surface of the chamber from entering the melt; and d. withdrawing molten glass.
Claim 3
Dependent Claim
31 words
The process defined in claim 1 wherein the inner surface of the chamber is lined with a layer of refractory and the refractory layer is coated with the layer of glass.
Claim 4
Dependent Claim
25 words
The process defined in claim 2 wherein the cooling is effected by directing a plurality of cooling fluid streams at the exterior of the chamber.
Claim 5
Dependent Claim
45 words
The process defined in claim 3 wherein the cooling fluid streams are directed in such a manner that the solidified layer of glass contains a plurality of annular ridges corresponding to the locations on the exterior of the chamber at which the streams are directed.
Claim 6
Dependent Claim
13 words
The process defined in claim 1 wherein the glass is a silicate glass.
Claim 7
Dependent Claim
13 words
The process defined in claim 2 wherein the glass is a silicate glass.
Claim 8
Dependent Claim
13 words
The process defined in claim 4 wherein the glass is a silicate glass.
Claim 9
Dependent Claim
12 words
The process defined in claim 5 wherein the cooling fluid is water.
Claim 10
Dependent Claim
12 words
The process defined in claim 6 wherein the cooling fluid is water.
Claim 11
Dependent Claim
12 words
The process defined in claim 7 wherein the cooling fluid is water.
Claim 12
Dependent Claim
118 words
The process defined in claim 2 wherein the refractory layer has a maximum thickness determined according to the following equation: ##EQU2## wherein: X = the maximum thickness in feet K = the average thermal conductivity of the refractory layer between T 1 and T 2 in BTU per square foot of refractory area per ° F per hour per foot of refractory thickness T 1 = the flow point temperature of the glass in ° F T 2 = the average temperature of the external surface of the chamber in ° F C = the average rate of removal of the heat from the external surface of the chamber in BTU per hour per square foot of surface
Claim 13
Dependent Claim
118 words
The process defined in claim 9 wherein the refractory layer has a maximum thickness determined according to the following equation: ##EQU3## wherein: X = the maximum thickness in feet K = the average thermal conductivity of the refractory layer between T 1 and T 2 in BTU per square foot of refractory area per ° F per hour per foot of refractory thickness T 1 = the flow point temperature of the glass in ° F T 2 = the average temperature of the external surface of the chamber in ° F C = the average rate of removal of the heat from the external surface of the chamber in BTU per hour per square foot of surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |