Patent US3306731A successfully refreshed from Google Patents.
US3306731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of degassing steel
Assignee: STANDARD MESSO GES fur CHEMIET
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Filing: 1964-11-18
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Granted: 1967-02-28
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Expires: 1984-11-18
Abstract
No abstract record available.
Inventors
- 👤 Messing Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:02
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A METHOD OF STEPWISE DEGASIFYING MOLTEN METAL, ESPECIALLY MOLTEN STEEL, BY POURING THE METAL TO BE DEGASIFIED SUCCESSIVELY INTO A FIRST CHAMBER FOR PRE-DEGASIFICATION IN A VACUUM AND FROM SAID FIRST CHAMBER INTO A SECOND CHAMBER FOR POST-DEGASIFICATION IN A VACUUM, WHICH INCLUDES THE STEPS OF: INTRODUCING THE MOLTEN METAL INTO SAID FIRST CHAMBER SO THAT THE STREAM OF METAL WILL BE TORN APART INTO DROPLETS WHILE MAINTAINING THE VACUUM IN SAID FIRST CHAMBER LOWER THAN THAT IN SAID SECOND CHAMBER AND WITHIN DESIRED LIMITS BY INTRODUCING A GAS FROM THE OUTSIDE INTO SAID FIRST CHAMBER, AND SUBSEQUENTLY PASSING THE THUS PRE-DEGASIFIED METAL IN A CONTINUOUS AND COHERENT STREAM INTO SAID SECOND CHAMBER FOR POST-DEGASIFICATION AT THE HIGHER VACUUM PREVAILING THEREIN.
Claim 2
Independent Claim
121 words
A METHOD OF STEPWISE DEGASIFYING MOLTEN METAL, ESPECIALLY MOLTEN STEEL, BY POURING THE METAL TO BE DEGASIFIED SUCCESSIVELY INTO A FIRST CHAMBER FOR PRE-DEGASIFICATION IN A VACUUM AND FROM SAID FIRST CHAMBER INTO A SECOND CHAMBER FOR POST-DEGASIFICATION IN A VACUUM, WHICH INCLUDES THE STEPS OF: INTRODUCING THE MOLTEN METAL INTO SAID FIRST CHAMBER SO THAT THE STREAM OF METAL WILL BE TORN APART INTO DROPLETS WHILE MAINTAINING THE VACUUM IN SAID FIRST CHAMBER LOWER THAN THAT IN SAID SECOND CHAMBER AND WITHIN DESIRED LIMITS BY INTRODUCING A GAS FROM THE OUTSIDE INTO SAID FIRST CHAMBER, AND SUBSEQUENTLY PASSING THE THUS PRE-DEGASIFIED METAL IN A CONTINUOUS AND COHERENT STREAM INTO SAID SECOND CHAMBER FOR POST-DEGASIFICATION AT THE HIGHER VACUUM PREVAILING THEREIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |