Patent US2497000A successfully refreshed from Google Patents.
US2497000A
Expired / Lapsed
US
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Tuyere structure
Assignee: American Steel and Wire Company of New Jersey
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Filing: 1948-03-17
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Granted: 1950-02-07
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Expires: 1968-03-17
Abstract
No abstract record available.
Inventors
- 👤 Harry O Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:33
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1393749A
Cited
US1441178A
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US1793849A
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US1883590A
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US2082280A
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US2175291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |