Patent US3125440A successfully refreshed from Google Patents.
US3125440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tlbr b
Assignee: —
•
Filing: —
•
Granted: 1964-03-17
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Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:35
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10; B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/113; B22D11/14; B22D11/147
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD OF DEGASSING STEEL IN A CLOSED VACUUM CHAMBER HAVING A TOP INLET AND A STOPPERED BOTTOM OUTLET, WHICH COMPRISES PLACING ALLOY ADDITIONS IN AN ENCLOSURE COMMUNICATING WITH SAID CHAMBER, EVACUATING THE CHAMBER, PLACING ON THE CHAMBER A LADLE HAVING A BOTTOM OUTLET AND CONTAINING MOLTEN STEEL OF A HIGHER CARBON CONTENT THAN THAT DESIRED IN THE FINAL PRODUCT, SEALING THE LADLE OUTLET TO THE CHAMBER INLET, TEEMING STEEL FROM SAID LADLE INTO SAID CHAMBER, HOLDING THE STEEL IN THE CHAMBER FOR THE TIME NECESSARY TO EFFECT CARBON DEOXIDATION OF THE STEEL, THEN RELEASING SAID ALLOY ADDITIONS FROM SAID ENCLOSURE INTO THE STEEL IN SAID CHAMBER WHILE MAINTAINING A
Claim 2
Independent Claim
110 words
A METHOD OF DEGASSING STEEL IN A CLOSED VACUUM CHAMBER HAVING A TOP INLET AND A STOPPERED BOTTOM OUTLET, WHICH COMPRISES PLACING ALLOY ADDITIONS IN AN ENCLOSURE COMMUNICATING WITH SAID CHAMBER, EVACUATING THE CHAMBER, PLACING ON THE CHAMBER A LADLE HAVING A BOTTOM OUTLET AND CONTAINING MOLTEN STEEL OF A HIGHER CARBON CONTENT THAN THAT DESIRED IN THE FINAL PRODUCT, SEALING THE LADLE OUTLET TO THE CHAMBER INLET, TEEMING STEEL FROM SAID LADLE INTO SAID CHAMBER, HOLDING THE STEEL IN THE CHAMBER FOR THE TIME NECESSARY TO EFFECT CARBON DEOXIDATION OF THE STEEL, THEN RELEASING SAID ALLOY ADDITIONS FROM SAID ENCLOSURE INTO THE STEEL IN SAID CHAMBER WHILE MAINTAINING A
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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) | 1967-03-17 | 1967-09-16 | 1968-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-17 | 1971-09-16 | 1972-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-17 | 1975-09-16 | 1976-03-17 | $7700.00 | Window Closed / Lapsed |