US3615316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Float glass method and apparatus with gas extraction means
Assignee: Nippon Sheet Glass Co Ltd
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Filing: 1968-06-12
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Granted: 1971-10-26
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Expires: 1988-06-12
Abstract
Abstract Glass ribbon is continuously manufactured on a bath of molten metal while preventing the formation of gaseous bubbles in the bath by applying a negative pressure or vacuum to the bath through a gas-permeable, porous material which is nonwettable with the molten metal.
Inventors
- 👤 Hideo Kita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:26
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B18/18; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
15 words
The improved process as defined in claim 1 wherein said porous material is porous graphite.
Claim 2
Dependent Claim
17 words
The improved process as defined in claim 1 wherein said porous material is a high alumina refractory.
Claim 3
Dependent Claim
23 words
The improved process as defined in claim 1 further including applying the reduced pressure at a level of from 0.5-50 mm. Hg. absolute.
Claim 4
Dependent Claim
120 words
Apparatus for use in the continuous manufacture of glass ribbon during which molten glass is fed onto a tank-supported bath of molten metal and advanced over the bath, said apparatus comprising a bath of molten metal, a tank structure for holding the bath, a hollow member of which at least a part of the surface wall is composed of a gas-permeable, porous material which is nonwettable by the molten metal, said hollow member being disposed at least partially within said bath with the outer surface of its porous wall in contact with the molten metal, vacuum pumping means disposed exteriorly of the bath, and conduits for connecting the space inside the hollow member with the exteriorly disposed vacuum pumping means.
Claim 5
Dependent Claim
13 words
Apparatus as defined in claim 5 wherein the porous material is porous graphite.
Claim 6
Dependent Claim
15 words
Apparatus as defined in claim 5 wherein the porous material is a high alumina refractory.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |