Patent US3326541A successfully refreshed from Google Patents.
US3326541A
Expired / Lapsed
US
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Glass tank structure with a regenerator chamber
Assignee: Harbison Walker Refractories Co
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Filing: 1965-10-24
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Granted: 1967-06-20
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Expires: 1985-10-24
Abstract
No abstract record available.
Inventors
- 👤 Davies Ben
- 👤 David C Hanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:00
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/04; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y10; Y10S; Y10S165/00; Y10S165/009; Y10S165/03; Y10S165/031
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
67 words
IN A GLASS MELTING FURNACE, A REGENERATOR CHAMBER CONTAINING A CHECKER SETTING COMPOSED OF AN UPPER, MIDDLE AND LOWER ZONE, SAID ZONE OF THE CHECKER SETTING BEING FABRICATED FROM REFRACTORIES SELECTED FROM THE GROUP CONSISTING OF STABILIZED FORSTERITE, MAGNESITE AND CHROME-MAGNESITE BRICK, AND SAID UPPER ZONE BEING FABRICATED FROM MAGNESITE BRICK ANALYZING BY WEIGHT ON AN OXIDE BASIS AT LEAST 90% MGO, UP TO ABOUT 2% TOTAL
References Cited (Backward Citations)
US2771285A
Cited
US2959406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-19 | 1970-12-19 | 1971-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-19 | 1974-12-19 | 1975-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-19 | 1978-12-19 | 1979-06-20 | $7700.00 | Window Closed / Lapsed |