US3352665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Degassing of melts
Assignee: ABB Norden Holding AB
•
Filing: 1965-02-01
•
Granted: 1967-11-14
•
Expires: 1985-02-01
Abstract
No abstract record available.
Inventors
- 👤 Stenkvist Sven-Einar
- 👤 Hanas Bertil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:45
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD FOR DEGASSING MELTS OF METAL OR METAL ALLOYS, WHICH COMPRISES PLACING THE MELT IN A CONTAINER, PLACING THE CONTAINER IN A VACUUM TIGHT TANK, EVACUATING SAID TANK TO A PRESSURE OF LESS THAN 20 TORR, STIRRING SAID MELT BY MEANS OF AN ELECTROMAGNETIC STIRRER FED WITH A MULTIPHASE CURRENT OF A FREQUENCY LESS THAN 10 CYCLES PER SECOND, AND DURING A FIRST INTERVAL OF THE STIRRING FEEDING A RELATIVELY FLOW POWER TO THE STIRRER, DURING AN INTERMEDIATE INTERVAL OF THE STIRRING FEEDING A LARGER POWER TO THE STIRRER THAN DURING SAID FIRST INTERVAL, DURING A LAST INTERVAL OF THE STIRRING FEEDING A FURTHER INCREASED POWER TO THE STIRRER.
Claim 2
Independent Claim
110 words
A METHOD FOR DEGASSING MELTS OF METAL OR METAL ALLOYS, WHICH COMPRISES PLACING THE MELT IN A CONTAINER, PLACING THE CONTAINER IN A VACUUM TIGHT TANK, EVACUATING SAID TANK TO A PRESSURE OF LESS THAN 20 TORR, STIRRING SAID MELT BY MEANS OF AN ELECTROMAGNETIC STIRRER FED WITH A MULTIPHASE CURRENT OF A FREQUENCY LESS THAN 10 CYCLES PER SECOND, AND DURING A FIRST INTERVAL OF THE STIRRING FEEDING A RELATIVELY FLOW POWER TO THE STIRRER, DURING AN INTERMEDIATE INTERVAL OF THE STIRRING FEEDING A LARGER POWER TO THE STIRRER THAN DURING SAID FIRST INTERVAL, DURING A LAST INTERVAL OF THE STIRRING FEEDING A FURTHER INCREASED POWER TO THE STIRRER.
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) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |