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Patent US3072981A successfully refreshed from Google Patents.
US3072981A
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Hot top casing for casting molds
Assignee: Sandvik AB
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Filing: 1959-12-21
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Granted: 1963-01-15
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Expires: 1979-12-21
Abstract
No abstract record available.
Inventors
- 👤 Davidson Per
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:22
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A HOT TOP CASING FOR AN INGOT CASTING MODE CONSISTING OF A MOLDED MIXTURE OF FROM 2 TO 15% BY WEIGHT OF A BINDER, A FIBROUS ORGANIC MATERIAL, 4 TO 10% BY WEIGHT OF A BINDER, UP TO 4% BY WEIGHT OF AN INORGANIC FIBROUS MATERIAL AND THE REMINDER CONSISTING ESSENTIALLY OF A GRANULAR FIREPROOF MATERIAL WHICH IS NOT DISINTEGRATED BY THE HEAT TO WHICH IT IS SUBJECTED IN USE SELECTED FROM THE GROUP CON SISTING OF QUARTZ, SAND, REFRACTOR SILICATES, BURNED DOLOMITE AND CINDERS, SAID GRANULAR FIREPROOF MATERIAL HAVING A MEDIUM GRAIN SIZE WITHIN THE RANGE FROM 0.6 TO 0.05 MM. AND SAID CASING BEING RELATIVELY THIN AND HAVING A SMOOTH INNER SURFACE.
Claim 2
Dependent Claim
114 words
A HOT TOP CASING FOR AN INGOT CASTING MODE CONSISTING OF A MOLDED MIXTURE OF FROM 2 TO 15% BY WEIGHT OF A BINDER, A FIBROUS ORGANIC MATERIAL, 4 TO 10% BY WEIGHT OF A BINDER, UP TO 4% BY WEIGHT OF AN INORGANIC FIBROUS MATERIAL AND THE REMINDER CONSISTING ESSENTIALLY OF A GRANULAR FIREPROOF MATERIAL WHICH IS NOT DISINTEGRATED BY THE HEAT TO WHICH IT IS SUBJECTED IN USE SELECTED FROM THE GROUP CON SISTING OF QUARTZ, SAND, REFRACTOR SILICATES, BURNED DOLOMITE AND CINDERS, SAID GRANULAR FIREPROOF MATERIAL HAVING A MEDIUM GRAIN SIZE WITHIN THE RANGE FROM 0.6 TO 0.05 MM. AND SAID CASING BEING RELATIVELY THIN AND HAVING A SMOOTH INNER SURFACE.
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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) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |