Patent US3008529A successfully refreshed from Google Patents.
US3008529A
Expired / Lapsed
US
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Core sample retaining means
Assignee: Acker Drill Co Inc
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Filing: 1959-01-20
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Granted: 1961-11-14
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Expires: 1979-01-20
Abstract
No abstract record available.
Inventors
- 👤 Eugene J Lynch
- 👤 Frederick W Davenhall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:01
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-11-13 | 1965-05-15 | 1965-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-13 | 1969-05-15 | 1969-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-13 | 1973-05-15 | 1973-11-14 | $7700.00 | Window Closed / Lapsed |