Patent US2660402A successfully refreshed from Google Patents.
US2660402A
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Core drilling apparatus
Assignee: Individual
•
Filing: 1949-12-19
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Granted: 1953-11-24
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Expires: 1969-12-19
Abstract
No abstract record available.
Inventors
- 👤 Verbol J Devine
- 👤 Lawrence V Devine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:03
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02; E21B25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR349859A
Cited
US873056A
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US945209A
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US961849A
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US992582A
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US1453683A
Cited
US1745567A
Cited
US2002387A
Cited
US2254641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |