Patent US2482937A successfully refreshed from Google Patents.
US2482937A
Expired / Lapsed
US
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Flame hardening of internal cylindrical surfaces
Assignee: Airco Inc
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Filing: 1946-08-21
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Granted: 1949-09-27
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Expires: 1966-08-21
Abstract
No abstract record available.
Inventors
- 👤 Robert M Rooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:54
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE634807C
Cited
US2275402A
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US2281333A
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US2279564A
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US2382515A
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US2415856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-09-26 | 1953-03-28 | 1953-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-26 | 1957-03-28 | 1957-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-26 | 1961-03-28 | 1961-09-27 | $7700.00 | Window Closed / Lapsed |