US2580171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-resistant ferritic alloy
Assignee: Kanthal AB
•
Filing: 1950-04-06
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Granted: 1951-12-25
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Expires: 1970-04-06
Abstract
No abstract record available.
Inventors
- 👤 Hagglund Erik H Mattiasson
- 👤 Rehnqvist Nils Gosta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:18
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; C22C38/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1274245A
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US1266928A
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US1621523A
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US1850953A
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US1914102A
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US1981719A
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US2021159A
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US2210309A
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US2160670A
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US2169007A
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US2174025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |