Patent US3452973A successfully refreshed from Google Patents.
US3452973A
Expired / Lapsed
US
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Vacuum degasifying apparatus with electromagnetic stirring means
Assignee: JFE Engineering Corp
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Filing: 1966-12-23
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Granted: 1969-07-01
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Expires: 1986-12-23
Abstract
No abstract record available.
Inventors
- 👤 Takaho Kawawa
- 👤 Masuta Okubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:50
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10; H; H05; H05B; H05B6/00; H05B6/02; H05B6/16; H05B6/34; H05B2213/00; H05B2213/02; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A VACUUM DEGASIFYING APPARATUS COMPRISING A VACUUM VESSEL IN COMMUNICATION WITH A SUPPLY CONDUIT FOR SUPPLYING MOLTEN METAL TO BE DEGASIFIED, AN EXHAUST PORT LEADING TO AN EVACUATING MEANS FOR DEGASIFICATION AND WITH A DISCHARGE CONDUIT FOR DESCHARGING MOLTEN METAL INTO A TURNDISH, AND MEANS FOR STIRRING MOLTEN METAL IN SAID VACUUM VESSEL AS WELL AS COMPENSATING DECREASE IN TEMPERATURE OF MOLTEN METAL AFTER DEGASIFICATION, CHARACTERIZED IN THAT SAID VACUUM VESSEL HAS AN ANNULAR CONFIGURATION SO AS TO FORM A CLOSED CIRCULATION PATH OF MOLTEN METAL CONTAINED THEREIN, AND THAT SAID MEANS IS A MAGNETIC CIRCUIT A PORTION OF WHICH VERTICALLY PENETRATES THE SUBSTANTIAL CENTER OF SAID CLOSED CIRCULATION PATH SO AS TO PRODUCE A LOW FREQUENCY ALTERNATING MAGNETIC FLUX WHICH LINKS WITH SAID CLOSED CIRCULATION PATH.
Claim 2
Dependent Claim
127 words
A VACUUM DEGASIFYING APPARATUS COMPRISING A VACUUM VESSEL IN COMMUNICATION WITH A SUPPLY CONDUIT FOR SUPPLYING MOLTEN METAL TO BE DEGASIFIED, AN EXHAUST PORT LEADING TO AN EVACUATING MEANS FOR DEGASIFICATION AND WITH A DISCHARGE CONDUIT FOR DESCHARGING MOLTEN METAL INTO A TURNDISH, AND MEANS FOR STIRRING MOLTEN METAL IN SAID VACUUM VESSEL AS WELL AS COMPENSATING DECREASE IN TEMPERATURE OF MOLTEN METAL AFTER DEGASIFICATION, CHARACTERIZED IN THAT SAID VACUUM VESSEL HAS AN ANNULAR CONFIGURATION SO AS TO FORM A CLOSED CIRCULATION PATH OF MOLTEN METAL CONTAINED THEREIN, AND THAT SAID MEANS IS A MAGNETIC CIRCUIT A PORTION OF WHICH VERTICALLY PENETRATES THE SUBSTANTIAL CENTER OF SAID CLOSED CIRCULATION PATH SO AS TO PRODUCE A LOW FREQUENCY ALTERNATING MAGNETIC FLUX WHICH LINKS WITH SAID CLOSED CIRCULATION PATH.
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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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |