Patent US2858972A successfully refreshed from Google Patents.
Patent US2644312A successfully refreshed from Google Patents.
US2644312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of zinc
Assignee: National Smelting Co Ltd
•
Filing: 1950-06-06
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Granted: 1953-07-07
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Expires: 1970-06-06
Abstract
No abstract record available.
Inventors
- 👤 Woods Stephen Esslemont
- 👤 Perry Bennett Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:39
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/04; C22B19/16; C22B19/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A COOLING SYSTEM FOR A POOL OF MOLTEN METAL COMPRISING A CLOSED CIRCUIT OF TUBES CONTAINED A READILY FUSIBLE METAL ALLOY IN LIQUID FORM AND HAVING A PART FOR FITTING INTO THE POOL OF MOLTEN METAL AND TWO GENERALLY VERTICAL PARTS INTERCONNECTED AT THEIR TOP ENDS AND WITH THE BOTTOM
Claim 2
Dependent Claim
50 words
A COOLING SYSTEM FOR A POOL OF MOLTEN METAL COMPRISING A CLOSED CIRCUIT OF TUBES CONTAINED A READILY FUSIBLE METAL ALLOY IN LIQUID FORM AND HAVING A PART FOR FITTING INTO THE POOL OF MOLTEN METAL AND TWO GENERALLY VERTICAL PARTS INTERCONNECTED AT THEIR TOP ENDS AND WITH THE BOTTOM
References Cited (Backward Citations)
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US1877762A
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US1959377A
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US1943315A
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US1922509A
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Cited
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US2468660A
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US2457548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |