Patent US3208537A successfully refreshed from Google Patents.
US3208537A
Expired / Lapsed
US
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Method of drilling
Assignee: Reed Roller Bit Co
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Filing: 1960-12-08
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Granted: 1965-09-28
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Expires: 1980-12-08
Abstract
No abstract record available.
Inventors
- 👤 William E Scarborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:03
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/28; E21B21/00; E21B21/01; E21B43/00; E21B43/30; E21B43/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A METHOD OF PRODUCING A LARGE BORE HOLD HAVING ITS UPPER END OPEN TO THE SURFACE OF THE EARTH COMPRISING PRODUCING A FIRST BOREHOLE, DRILLING A SECOND BOREHOLE SPACED FROM SAID FIRST BORHOLE, CONNECTING THE SAID BOREHOLE NEAR THE NETHER PORTIONS THEREOF, ENLARGING THE SAID FIRST BOREHOLE FROM THE SURFACE OF THE EARTH TO A SUBSTANTIAL DEPTH, CIRCULATING THE CUTTINGS PRODUCED BY THE SAID ENLARGING DOWNWARDLY IN THE SAID FIRST BOREHOLE AND UPWARDLY THROUGH THE SAID SECOND BOREHOLE, AND ACCELERATING THE CUTTINGS UPWARDLY THROUGH SAID SECOND BOREHOLE.
Claim 2
Independent Claim
87 words
A METHOD OF PRODUCING A LARGE BORE HOLD HAVING ITS UPPER END OPEN TO THE SURFACE OF THE EARTH COMPRISING PRODUCING A FIRST BOREHOLE, DRILLING A SECOND BOREHOLE SPACED FROM SAID FIRST BORHOLE, CONNECTING THE SAID BOREHOLE NEAR THE NETHER PORTIONS THEREOF, ENLARGING THE SAID FIRST BOREHOLE FROM THE SURFACE OF THE EARTH TO A SUBSTANTIAL DEPTH, CIRCULATING THE CUTTINGS PRODUCED BY THE SAID ENLARGING DOWNWARDLY IN THE SAID FIRST BOREHOLE AND UPWARDLY THROUGH THE SAID SECOND BOREHOLE, AND ACCELERATING THE CUTTINGS UPWARDLY THROUGH SAID SECOND BOREHOLE.
References Cited (Backward Citations)
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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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |