Patent US2471485A successfully refreshed from Google Patents.
US2471485A
Expired / Lapsed
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Mandrel with means for clamping and spreading tubes
Assignee: AO Smith Corp
•
Filing: 1943-10-23
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Granted: 1949-05-31
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Expires: 1963-10-23
Abstract
No abstract record available.
Inventors
- 👤 Frederick A Gruetjen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:56
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/78
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US2063683A
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US2341278A
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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) | 1952-05-30 | 1952-11-29 | 1953-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-30 | 1956-11-29 | 1957-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-30 | 1960-11-29 | 1961-05-31 | $7700.00 | Window Closed / Lapsed |