US2620174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Billet heating furnace
Assignee: Allegheny Ludlum Steel Corp
•
Filing: 1948-04-30
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Granted: 1952-12-02
•
Expires: 1968-04-30
Abstract
No abstract record available.
Inventors
- 👤 Anthony L Passafaro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:27
CPC Classifications
F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/201; F27B9/208; F27B9/22; F27B9/222; F27B9/30; F27B9/36; F27D; F27D21/00; F27D21/0014; F27B9/24; F27B2009/2492; F27D19/00; F27D2019/0006; F27D2019/0018; F27D2019/0028; F27D2019/0034; F27D2019/004; F27D2019/0043; F27M; F27M2001/00; F27M2001/15; F27M2001/1539; F27M2001/1547; F27M2001/1552
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1335648A
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US943373A
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US1861790A
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GB303830A
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US1921956A
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US2451053A
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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) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |