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US3061300A
Expired / Lapsed
US
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Tuyere with preformed refractory nose and sleeve
Assignee: United States Steel Corp
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Filing: 1959-09-22
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Granted: 1962-10-30
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Expires: 1979-09-22
Abstract
No abstract record available.
Inventors
- 👤 William H Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:23
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE277400C
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DE60019C
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US176913A
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US318604A
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US1729447A
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US1662850A
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US1849718A
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US2500089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |