Patent US2467668A successfully refreshed from Google Patents.
US2467668A
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Mandrel for expanding internallyfinned tubes
Assignee: Chase Brass and Copper Co Inc
•
Filing: 1947-10-30
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Granted: 1949-04-19
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Expires: 1967-10-30
Abstract
No abstract record available.
Inventors
- 👤 August W Hallberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:27
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/30; B21C23/00; B21C23/02; B21C23/04; B21C23/08; B21C23/10; B21D; B21D39/00; B21D39/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T29/49384
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US485691A
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US1304954A
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US734264A
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US1646384A
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US1813096A
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DE648920C
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US2173665A
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US2357123A
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US2298379A
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US2281207A
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US2367226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-18 | 1952-10-18 | 1953-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-18 | 1956-10-18 | 1957-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-18 | 1960-10-18 | 1961-04-19 | $7700.00 | Window Closed / Lapsed |