US3323604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coring drill
Assignee: Individual
•
Filing: 1964-08-28
•
Granted: 1967-06-06
•
Expires: 1984-08-28
Abstract
No abstract record available.
Inventors
- 👤 Homer I Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:00
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/02; E21B10/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
CORE DRILLING APPARATUS COMPRISING: AN OUTER PIPE, A SEPARATOR TUBE OF SMALLER DIAMETER THAN SAID OUTER PIPE SECURED WITHIN SAID OUTER PIPE TO PROVIDE A CONTINUOUS DOWNWARD FLOW PASSAGE BETWEEN SAID OUTER PIPE AND SEPARATOR TUBE AND A CONTINUOUS UPWARD FLOW PASSAGE THROUGH SAID SEPARATOR TUBE, AN ANNULAR DRILL BIT SECURED AT THE LOWER ENDS OF SAID OUTER PIPE AND SEPARATOR TUBE ADAPTED TO CUT A CORE IN A SUBSURFACE FORMATION OF A DIAMETER SMALLER THAN SAID SEPARATOR TUBE, A CORE TUBE SECURED WITHIN SAID SEPARATOR TUBE, THE LOWER END OF SAID CORE TUBE BEING OF A DIAMETER ONLY SLIGHTLY GREATER THAN SAID CORE DIAMETER AND EXTENDING IN CLOSE PROXIMITY TO SAID DRILL BIT SNUGLY TO EMBRACE A CORE BEING CUT TO ENABLE ENTRY OF SAID CORE INTO SAID CORE TUBE BUT TO PREVENT ENTRY OF OTHER DRILL BIT CUTTINGS, MEANS FORMING PERFORATIONS INSAID CORE TUBE ALONG THE LENGTH THEREOF SUBSTANTIALLY TO EQUALIZE PRESSURE BETWEEN SAID CORE TUBE AND SAID SEPARATING TUBE, AT LEAST ONE PORT FOR CONDUCTING FLUID FROM SAID DOWNWARD FLOW PASSAGE TO THE EXTERIOR OF SAID DRILL BIT,
Claim 2
Dependent Claim
181 words
CORE DRILLING APPARATUS COMPRISING: AN OUTER PIPE, A SEPARATOR TUBE OF SMALLER DIAMETER THAN SAID OUTER PIPE SECURED WITHIN SAID OUTER PIPE TO PROVIDE A CONTINUOUS DOWNWARD FLOW PASSAGE BETWEEN SAID OUTER PIPE AND SEPARATOR TUBE AND A CONTINUOUS UPWARD FLOW PASSAGE THROUGH SAID SEPARATOR TUBE, AN ANNULAR DRILL BIT SECURED AT THE LOWER ENDS OF SAID OUTER PIPE AND SEPARATOR TUBE ADAPTED TO CUT A CORE IN A SUBSURFACE FORMATION OF A DIAMETER SMALLER THAN SAID SEPARATOR TUBE, A CORE TUBE SECURED WITHIN SAID SEPARATOR TUBE, THE LOWER END OF SAID CORE TUBE BEING OF A DIAMETER ONLY SLIGHTLY GREATER THAN SAID CORE DIAMETER AND EXTENDING IN CLOSE PROXIMITY TO SAID DRILL BIT SNUGLY TO EMBRACE A CORE BEING CUT TO ENABLE ENTRY OF SAID CORE INTO SAID CORE TUBE BUT TO PREVENT ENTRY OF OTHER DRILL BIT CUTTINGS, MEANS FORMING PERFORATIONS INSAID CORE TUBE ALONG THE LENGTH THEREOF SUBSTANTIALLY TO EQUALIZE PRESSURE BETWEEN SAID CORE TUBE AND SAID SEPARATING TUBE, AT LEAST ONE PORT FOR CONDUCTING FLUID FROM SAID DOWNWARD FLOW PASSAGE TO THE EXTERIOR OF SAID DRILL BIT,
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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) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |