Patent US916611A successfully refreshed from Google Patents.
Patent US2780271A successfully refreshed from Google Patents.
US2780271A
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Apparatus for mechanically expanding large diameter pipe
Assignee: AO Smith Corp
•
Filing: 1951-09-27
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Granted: 1957-02-05
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Expires: 1971-09-27
Abstract
No abstract record available.
Inventors
- 👤 John C Ewart
- 👤 Malke Sven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:58
CPC Classifications
B; B21; B21D; B21D41/00; B21D41/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US410630A
Cited
US601689A
Cited
US1084042A
Cited
US1193078A
Cited
US183241A
Cited
US872168A
Cited
US1022720A
Cited
US1166040A
Cited
US1504764A
Cited
US1458605A
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US1469565A
Cited
US1549868A
Cited
US1623657A
Cited
US1719720A
Cited
US1813096A
Cited
DE610115C
Cited
FR803247A
Cited
US2350410A
Cited
US2325508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |