US3355537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum induction furnace lining construction using zircon and calcium aluminate
Assignee: Harbison Walker Refractories Co
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Filing: 1964-10-12
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Granted: 1967-11-28
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Expires: 1984-10-12
Abstract
No abstract record available.
Inventors
- 👤 Peter T Troell
- 👤 Albert L Renkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
AN ALUMINUM INDUCTION FURNACE INCLUDING A PRIMARY COIL SEPARATED FROM A MOLTEN METAL CONFINING CAVITY BY A THIN LAYER OF REFRACTORY RAMMING MIX, SAID REFRACTORY CONSISTING OF A BATCH OF A ZIRCON REFRACTORY AGGREGATE IN A BRICKMAKING GRADED SIZE RANGE AND FINELY DIVIDED COMMERCIAL CALCIUM ALUMINATE, SAID COMMERCIAL CALCIUM ALUMINATE BEING SUBSTANTIALLY FREE OF IRON OXIDE AND CONTAINING AT LEAST ABOUT 75% OF CALCIUM ALUMINATE COMPOUNDS, SAID BATCH BEING SUBSTANTIALLY FREE OF FREE LIME AND COMPRISED OF ABOUT 90 TO 60% REFRACTORY AGGREGATE AND ABOUT 10 TO 40% CALCIUM ALUMINATE, BY WEIGHT.
Claim 2
Dependent Claim
92 words
AN ALUMINUM INDUCTION FURNACE INCLUDING A PRIMARY COIL SEPARATED FROM A MOLTEN METAL CONFINING CAVITY BY A THIN LAYER OF REFRACTORY RAMMING MIX, SAID REFRACTORY CONSISTING OF A BATCH OF A ZIRCON REFRACTORY AGGREGATE IN A BRICKMAKING GRADED SIZE RANGE AND FINELY DIVIDED COMMERCIAL CALCIUM ALUMINATE, SAID COMMERCIAL CALCIUM ALUMINATE BEING SUBSTANTIALLY FREE OF IRON OXIDE AND CONTAINING AT LEAST ABOUT 75% OF CALCIUM ALUMINATE COMPOUNDS, SAID BATCH BEING SUBSTANTIALLY FREE OF FREE LIME AND COMPRISED OF ABOUT 90 TO 60% REFRACTORY AGGREGATE AND ABOUT 10 TO 40% CALCIUM ALUMINATE, BY WEIGHT.
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) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |