Patent US3320611A successfully refreshed from Google Patents.
US3149959A
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Double chamber vacuum degassing method, apparatus, and ladle
Assignee: PULLMAN Inc A DE CORP
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Filing: 1961-08-14
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Granted: 1964-09-22
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Expires: 1981-08-14
Abstract
No abstract record available.
Inventors
- 👤 Francis E Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:21
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN A DOUBLE CHAMBER LADLE VACUUM DEGASSING METHOD, STEPS COMPRISING, IN COMBINGATIN, POURING MOLTEN METAL INTO A RECEIVING ZONE IN A DOUBLE UPRIGHT ZONE LADLE, COVERING AT LEAST SAID RECEIVING ZONE, VACUUM DEGASSING SAID MOLTEN METAL IN SAID RECEIVING ZONE, TRANSFERRING SAID LADLE TO A POURING STATION, OPENING SAID RECEIVING ZONE NEAR THE BOTTOM THEREOF INTO A DISCHARGE ZONE IS SAID
Claim 2
Dependent Claim
61 words
IN A DOUBLE CHAMBER LADLE VACUUM DEGASSING METHOD, STEPS COMPRISING, IN COMBINGATIN, POURING MOLTEN METAL INTO A RECEIVING ZONE IN A DOUBLE UPRIGHT ZONE LADLE, COVERING AT LEAST SAID RECEIVING ZONE, VACUUM DEGASSING SAID MOLTEN METAL IN SAID RECEIVING ZONE, TRANSFERRING SAID LADLE TO A POURING STATION, OPENING SAID RECEIVING ZONE NEAR THE BOTTOM THEREOF INTO A DISCHARGE ZONE IS SAID
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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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |