Patent US2830831A successfully refreshed from Google Patents.
US2830831A
Expired / Lapsed
US
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Pipe expander having sealing ring retaining cap for hydraulic ram
Assignee: Individual
•
Filing: 1953-04-27
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Granted: 1958-04-15
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Expires: 1973-04-27
Abstract
No abstract record available.
Inventors
- 👤 John P Bosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:12
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/033; B21D26/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US523009A
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US709276A
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US794110A
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US872659A
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US1525101A
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US1805962A
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US2631640A
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US2623570A
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US2671339A
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US2667136A
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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) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |