US3130797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for drilling bore holes
Assignee: Sunoco Inc
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Filing: 1961-01-31
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Granted: 1964-04-28
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Expires: 1981-01-31
Abstract
No abstract record available.
Inventors
- 👤 Ford L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:59
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
THE METHOD OF DRILLING A BORE HOLE THROUGH EARTH STRATA COMPRISING THE STEPS OF; EFFECTING ROTARY DRILLING WITH A HOLLOW DRILL STEM DRIVING A DRILL BIT HAVING A SOLID CENTRAL PORTION AND A NON-AXIALLY ALIGNED JET OPENING TO FORM A BORE HOLE OF A FIRST DEPTH, INTRODUCING AN EXPLOSIVE MEMBER INTO SAID HOLLOW DRILL STEM AT THE SURFACE OF THE BORE HOLE, EFFECTING AXIAL PASSAGE OF SAID MEMBER DOWNWARDLY THROUGH SAID HOLLOW DRILL STEM TO THE VICINITY OF SAID BIT, ORIENTATING SAID MEMBER SO AS TO PASS AT LEAST PARTIALLY THROUGH SAID NON-AXIAL JET OPENING TO ARRIVE AT A POSITION ADJACENT THE EARTH STRATA FORMING THE BOTTOM OF SAID BORE HOLE, DETONATING SAID MEMBER IN SAID POSITION TO SHATTER SAID EARTH STRATA, AND CONTINUING ROTARY DRILLING THROUGH SAID SHATTERED STRATA BY SAID DRILL BIT.
Claim 2
Independent Claim
134 words
THE METHOD OF DRILLING A BORE HOLE THROUGH EARTH STRATA COMPRISING THE STEPS OF; EFFECTING ROTARY DRILLING WITH A HOLLOW DRILL STEM DRIVING A DRILL BIT HAVING A SOLID CENTRAL PORTION AND A NON-AXIALLY ALIGNED JET OPENING TO FORM A BORE HOLE OF A FIRST DEPTH, INTRODUCING AN EXPLOSIVE MEMBER INTO SAID HOLLOW DRILL STEM AT THE SURFACE OF THE BORE HOLE, EFFECTING AXIAL PASSAGE OF SAID MEMBER DOWNWARDLY THROUGH SAID HOLLOW DRILL STEM TO THE VICINITY OF SAID BIT, ORIENTATING SAID MEMBER SO AS TO PASS AT LEAST PARTIALLY THROUGH SAID NON-AXIAL JET OPENING TO ARRIVE AT A POSITION ADJACENT THE EARTH STRATA FORMING THE BOTTOM OF SAID BORE HOLE, DETONATING SAID MEMBER IN SAID POSITION TO SHATTER SAID EARTH STRATA, AND CONTINUING ROTARY DRILLING THROUGH SAID SHATTERED STRATA BY 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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |