Patent US3308897A successfully refreshed from Google Patents.
US3308897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth coring punch and drive apparatus therefor
Assignee: ALBERTA OPPORTUNITY Co
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Filing: 1964-04-06
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Granted: 1967-03-14
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Expires: 1984-04-06
Abstract
No abstract record available.
Inventors
- 👤 Norman D Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:16
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/001; E21B7/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
AN EARTH PERFORATING PUNCH FOR SINKING COMPACTED WALL BOREHOLES IN ROCK FILL AND RECOVERING THE CONTENTS OF SAID BOREHOLES, COMPRISING AN UPWARDLY ELONGATE TUBULAR CASING HAVING A CLOSING UPPER END WALL, AN OPEN SHOE IN THE FORM OF AN ANNULUS INTEGRALLY JOINED WITH AND DEPENDING FROM THE PERIPHERY OF THE LOWER END OF SAID CASING, SAID SHOE HAVING A PERIPHERAL DEPENDING CUTTING EDGE AND HAVING INNER SIDE WALLS BEVELLED TO PROVIDE AN APERTURE OF WHICH THE CROSS SECTIONAL AREA DECREASES UPWARDLY FROM SAID CUTTING EDGE, THE SMALLEST CROSS-SECTIONAL DIMENSIONS OF SAID APERTURE BEING SIGNIFICANTLY SMALLER THAN ANY INTERNAL CROSS-SECTIONAL DIMENSIONS OF SAID CASING, SAID SHOE ALSO HAVING A PLURALITY OF WEDGE-SHAPED TEETH UNIFORMLY SPACED APART ALONG THE PERIPHERAL CUTTING
Claim 2
Dependent Claim
119 words
AN EARTH PERFORATING PUNCH FOR SINKING COMPACTED WALL BOREHOLES IN ROCK FILL AND RECOVERING THE CONTENTS OF SAID BOREHOLES, COMPRISING AN UPWARDLY ELONGATE TUBULAR CASING HAVING A CLOSING UPPER END WALL, AN OPEN SHOE IN THE FORM OF AN ANNULUS INTEGRALLY JOINED WITH AND DEPENDING FROM THE PERIPHERY OF THE LOWER END OF SAID CASING, SAID SHOE HAVING A PERIPHERAL DEPENDING CUTTING EDGE AND HAVING INNER SIDE WALLS BEVELLED TO PROVIDE AN APERTURE OF WHICH THE CROSS SECTIONAL AREA DECREASES UPWARDLY FROM SAID CUTTING EDGE, THE SMALLEST CROSS-SECTIONAL DIMENSIONS OF SAID APERTURE BEING SIGNIFICANTLY SMALLER THAN ANY INTERNAL CROSS-SECTIONAL DIMENSIONS OF SAID CASING, SAID SHOE ALSO HAVING A PLURALITY OF WEDGE-SHAPED TEETH UNIFORMLY SPACED APART ALONG THE PERIPHERAL CUTTING
References Cited (Backward Citations)
US175672A
Cited
US1894999A
Cited
US1882906A
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US2214970A
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US2659584A
Cited
US3194328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |