US3279776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass melting vats having refractory bricks containing chromoxide
Assignee: Flachglas Wernberg GmbH
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Filing: 1964-12-08
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Granted: 1966-10-18
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Expires: 1984-12-08
Abstract
No abstract record available.
Inventors
- 👤 Loffler Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/42; C03; C03B; C03B5/00; C03B5/16; C03B5/42; C04B35/12; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A GLASS MELTING VAT HAVING ASCENDING WALLS CONSTITUTED SUBSTANTIALLY OF ALUMINA-CONTAINING REFRACTORY FURNACE-BUILDING MATERIALS AND ADAPTED FOR CONTAINING A GLASS MELT THEREIN TO A DETERMINABLE LEVEL, SAID VAT COMPRISING A HORIZONTALLY EXTENDING TOP LAYER ON SAID WALL AT A LEVEL CORRESPONDING APPROXIMATELY TO THAT OF THE MENISCUS OF THE GLASS MELT, SAID LAYER BEING CONSTITUTED OF AN ALUMINA-FREE AND LOW SILICIC ACID HIGHLY REFRACTORY MATERIAL, WHICH CONSISTS ESSENTIALLY OF CHROMIUM OXIDE OR MIXTURES OF CHROMIUM OXIDE AND ZIRCONIUM OXIDE AND
Claim 2
Dependent Claim
80 words
A GLASS MELTING VAT HAVING ASCENDING WALLS CONSTITUTED SUBSTANTIALLY OF ALUMINA-CONTAINING REFRACTORY FURNACE-BUILDING MATERIALS AND ADAPTED FOR CONTAINING A GLASS MELT THEREIN TO A DETERMINABLE LEVEL, SAID VAT COMPRISING A HORIZONTALLY EXTENDING TOP LAYER ON SAID WALL AT A LEVEL CORRESPONDING APPROXIMATELY TO THAT OF THE MENISCUS OF THE GLASS MELT, SAID LAYER BEING CONSTITUTED OF AN ALUMINA-FREE AND LOW SILICIC ACID HIGHLY REFRACTORY MATERIAL, WHICH CONSISTS ESSENTIALLY OF CHROMIUM OXIDE OR MIXTURES OF CHROMIUM OXIDE AND ZIRCONIUM OXIDE AND
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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) | 1969-10-17 | 1970-04-18 | 1970-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-17 | 1974-04-18 | 1974-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-17 | 1978-04-18 | 1978-10-18 | $7700.00 | Window Closed / Lapsed |