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US2566671A
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Rotary drilled hole enlarger
Assignee: PEARL EDITH LIVINGSTONE
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Filing: 1948-08-21
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Granted: 1951-09-04
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Expires: 1968-08-21
Abstract
No abstract record available.
Inventors
- 👤 Livingstone James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:39
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/32; E21B10/325
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US79400A
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US465103A
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US1304167A
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US729743A
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US1375817A
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US1515780A
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US1560019A
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US1608945A
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US2244674A
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US2466991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-03 | 1955-03-05 | 1955-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-03 | 1959-03-05 | 1959-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-03 | 1963-03-05 | 1963-09-04 | $7700.00 | Window Closed / Lapsed |