US3496280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining steel in plasma-arc remelting
Assignee: United States Steel Corp
•
Filing: 1968-08-15
•
Granted: 1970-02-17
•
Expires: 1988-08-15
Abstract
No abstract record available.
Inventors
- 👤 Donald A Dukelow
- 👤 Keith K Kappmeyer
- 👤 Robert J King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:05
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/16; C22B9/22; C22B9/226; C22B9/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2207746A
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US2189387A
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US2686822A
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US3147329A
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US3042513A
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US3267529A
Cited
US3280295A
Cited
US3404078A
Cited
US3422206A
Cited
US3380904A
Cited
US3429691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |