Patent US2461734A successfully refreshed from Google Patents.
US2461734A
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Flame hardening apparatus
Assignee: RK Leblond Machine Tool Co
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Filing: 1945-12-08
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Granted: 1949-02-15
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Expires: 1965-12-08
Abstract
No abstract record available.
Inventors
- 👤 Albert L Hartley
- 👤 Adolph H Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:44
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/32; C21D1/00; C21D1/06; C21D1/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB225333A
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US1711835A
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GB294709A
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US2188637A
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US2273809A
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US2254306A
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US2220002A
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US2294187A
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US2274861A
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US2312839A
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US2433055A
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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) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |