US3583859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for containing of molten metal in a glass sheet float apparatus
Assignee: Pilkington Group Ltd
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Filing: 1969-05-26
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Granted: 1971-06-08
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Expires: 1989-05-26
Abstract
Abstract GASEOUS ACCUMULATIONS ARE AVOIDED ON THE REFRACTORY BLOCKS OF THE TANK STRUCTURE SUPPORTING A BATH OF MOLTEN METAL ALONG WHICH GLASS IS ADVANCED IN THE FLOAT PROCESS FOR THE MANUFACTURE OF FLAT GLASS, BY APPLYING A NEGATIVE PRESSURE TO A RESTRICTED INTERSPACE SURROUNDING THE REFRACTORY BLOCKS AND SEALING OFF THE HEADSPACE FROM THE INTERSPACE TO INTERCEPT DIRECT GAS FLOW FROM THE HEADSPACE INTO THE INTERSPACE.
Inventors
- 👤 Jack Lawrenson
- 👤 Albert Sidney Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:41
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B18/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |