US3411716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen lance for steelmaking furnaces
Assignee: United States Steel Corp
•
Filing: 1966-05-11
•
Granted: 1968-11-19
•
Expires: 1986-05-11
Abstract
No abstract record available.
Inventors
- 👤 Raymond C Stephan
- 👤 Calvin M Willey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:50
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56; C21C5/567; C21C5/28; C21C5/42; C21C5/46; C21C5/4606
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US673756A
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US1125559A
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US1602845A
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AT174388B
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US3130252A
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GB1003514A
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US3241825A
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US3216714A
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GB995688A
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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) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |