Patent US2631823A successfully refreshed from Google Patents.
US2631823A
Expired / Lapsed
US
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Pipe driving point
Assignee: Individual
•
Filing: 1947-10-21
•
Granted: 1953-03-17
•
Expires: 1967-10-21
Abstract
No abstract record available.
Inventors
- 👤 Fred E Dannheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:21
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/046
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US982023A
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US1616666A
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GB486235A
Cited
US2179689A
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GB528593A
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US2425012A
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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) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |