US3795500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of gases from the molten bath of a float glass operation
Assignee: Individual
•
Filing: 1971-09-21
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Granted: 1974-03-05
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Expires: 1991-09-21
Abstract
Abstract In the float process for glass manufacture, gases are extracted from the molten metal bath by applying suction to a removable body of porous nonmetallic refractory material, for example graphite or alumino-silicate refractory, which is immersed in the bath alongside the path of the glass ribbon.
Inventors
- 👤 N Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:40
CPC Classifications
D; D01; D01G; D01G11/00; C; C03; C03B; C03B18/00; C03B18/02; C03B18/18; C22; C22B; C22B9/00; C22B9/04; F; F27; F27B; F27B5/00; F27B5/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/66
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
129 words
Float glass manufacturing apparatus comprising a tank structure containing a molten metal bath over which a protective atmosphere is maintained, means for advancing a ribbon of glass along the bath, a removable body, at least a portion of which body is of porous non-metallic refractory material and is immersed in the bath alongside the path of travel of the ribbon of glass, and which body is separated from the tank side walls and the tank floor, means for rendering the surface of any exposed portion of said removable body not so immersed and exposed to the atmosphere over the molten metal bath impermeable to said atmosphere, and means for applying suction to said body to extract gases from the bath through said at least a portion of said body.
Claim 2
Dependent Claim
90 words
Apparatus according to claim 2, wherein said immersed portion of said removable body is formed as a porous plate, said suction-applying means comprises a suction line and a block of porous non-metallic refractory material cemented to the upper surface of said plate, which block is formed with suction passage means extending therethrough to the interface between the block and the plate, said suction line is connected to the outer end of said suction passage means, and the outer surface of said block is rendered impervious by a glazing coating thereon.
Claim 3
Dependent Claim
45 words
Apparatus according to claim 3, wherein said porous plate and porous block are made from porous graphite material having an porosity of 18 to 25 percent with the majority of the pores in the range 2 to 4 microns in diameter, said porosity being open.
Claim 4
Dependent Claim
45 words
Apparatus according to claim 3, wherein said porous plate and porous block are made from an alumino-silicate refractory having an porosity of 18 to 28 percent with the majority of the pores in the range 0.2 to 2 microns in diameter, said porosity being open.
Claim 5
Dependent Claim
96 words
AppAratus according to claim 2, wherein said immersed portion of the removable porous body is a block of porous non-metallic refractory material formed with a blind bore of stepped diameter having a sunk central part and a wider upper part, said suction applying means comprises a suction pipe one end of which is fixed into the central part of the bore, a sleeve of glazed refractory material is fixed into the wider upper part of the bore, and a seal of melted crushed glass fills substantially the whole interspace between the suction pipe and the sleeve.
Claim 6
Dependent Claim
42 words
Apparatus according to claim 6, wherein said porous block is made from porous graphite material having an porosity of 18 to 25 percent with the majority of the pores in the range 2 to 4 microns in diameter, said porosity being open.
Claim 7
Dependent Claim
36 words
Apparatus according to claim 6, wherein said porous block is made from an alumino-silicate refractory having an open porosity of 18 to 28 percent with the majority of pores in the range 0.2 to 2 microns.
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |