Patent US3320053A successfully refreshed from Google Patents.
US3320053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of injecting gases into steel melts
Assignee: Bethlehem Steel Corp
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Filing: 1964-09-25
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Granted: 1967-05-16
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Expires: 1984-09-25
Abstract
No abstract record available.
Inventors
- 👤 Albert L Lehman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:34
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A METHOD OF KEEPING THE TIP OF A INJECTION TUBE IN CONTACT WITH MOLTEN METAL CONSTANTLY OPEN COMPRISING MAINTAINING A CONTINUAL FLOW OF NON-OXIDIZING GAS THROUGH SAID TUBE AND INTERMITTENLY ADDING TO SAID FLOW OF NONOXIDIZING GAS, SMALL QUANTITIES OF AN OXIDIZING GAS SUFFICIENT TO MELT ANY ACCRETIONS OF METAL THAT MAY HAVE FORMED AROUND THE TIP OF SAID TUBE.
Claim 2
Independent Claim
60 words
A METHOD OF KEEPING THE TIP OF A INJECTION TUBE IN CONTACT WITH MOLTEN METAL CONSTANTLY OPEN COMPRISING MAINTAINING A CONTINUAL FLOW OF NON-OXIDIZING GAS THROUGH SAID TUBE AND INTERMITTENLY ADDING TO SAID FLOW OF NONOXIDIZING GAS, SMALL QUANTITIES OF AN OXIDIZING GAS SUFFICIENT TO MELT ANY ACCRETIONS OF METAL THAT MAY HAVE FORMED AROUND THE TIP OF SAID TUBE.
References Cited (Backward Citations)
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Cited
GB368780A
Cited
US2077568A
Cited
US2893860A
Cited
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Cited
US3042510A
Cited
US3099699A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |