US3251680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for treating steels
Assignee: Fuji Iron and Steel Co Ltd
•
Filing: 1963-05-16
•
Granted: 1966-05-17
•
Expires: 1983-05-16
Abstract
No abstract record available.
Inventors
- 👤 Norman P Goss
- 👤 Watanabe Shozo
- 👤 Watanabe Hideo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:22
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0037; C21C7/0043
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
THE METHOD OF REMOVING INCLUSIONS FROM MOLTEN STEEL WHICH COMPRISES THE STEPS OF FORMING A PLURALITY OF STREAMS OF MOLTEN METAL AND PROJECTING INERT GAS THEREAGAINST TO DISINTEGRATE THE STREAMS OF METAL INTO PARTICLES AND ALLOWING THE PARTICLES TO DESCEND THROUGH A FILTER COMPOSED OF APPROXIMATELY 52% CAO, 14% SIO2, 5% MGO, 7% AL2O3 AND 22% CAF FOR SCRUBBING OUT UNDESIRABLE INCLUSIONS.
Claim 2
Independent Claim
62 words
THE METHOD OF REMOVING INCLUSIONS FROM MOLTEN STEEL WHICH COMPRISES THE STEPS OF FORMING A PLURALITY OF STREAMS OF MOLTEN METAL AND PROJECTING INERT GAS THEREAGAINST TO DISINTEGRATE THE STREAMS OF METAL INTO PARTICLES AND ALLOWING THE PARTICLES TO DESCEND THROUGH A FILTER COMPOSED OF APPROXIMATELY 52% CAO, 14% SIO2, 5% MGO, 7% AL2O3 AND 22% CAF FOR SCRUBBING OUT UNDESIRABLE INCLUSIONS.
Claim 3
Dependent Claim
43 words
IN COMBINATION, A LADLE, A SHALLOW TUNDISH TYPE COVER THEREFOR FORMING A SHALLOW MOLTEN METAL BATH CONTAINER HAVING A PLURALITY OF METAL OUTLET NOZZLES THEREIN OF APPROXIMATELY 50 MM. DIAMETER FOR DIRECTING A PLURALITY OF FINE STREAMS OF MOLTEN METAL INTO THE LADLE.
Claim 4
Dependent Claim
43 words
IN COMBINATION, A LADLE, A SHALLOW TUNDISH TYPE COVER THEREFOR FORMING A SHALLOW MOLTEN METAL BATH CONTAINER HAVING A PLURALITY OF METAL OUTLET NOZZLES THEREIN OF APPROXIMATELY 50 MM. DIAMETER FOR DIRECTING A PLURALITY OF FINE STREAMS OF MOLTEN METAL INTO THE LADLE.
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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) | 1969-05-16 | 1969-11-15 | 1970-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-16 | 1973-11-15 | 1974-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-16 | 1977-11-15 | 1978-05-17 | $7700.00 | Window Closed / Lapsed |