US3130798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for drilling bore holes
Assignee: Schramm Inc
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Filing: 1960-01-21
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Granted: 1964-04-28
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Expires: 1980-01-21
Abstract
No abstract record available.
Inventors
- 👤 Harold J Schramm
- 👤 Alfred N Gustafson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:53
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/14; C; C09; C09K; C09K8/00; C09K8/02; C09K8/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF DRILLING A DEEP BORE HOLE DOWNWARDLY INTO THE EARTH AT A LOCATION WHEREIN THE BORE HOLE PENETRATES A STRATUM FROM WHICH WATER WILL ENTER THE BORE HOLE, COMPRISING LOWERING INTO THE BORE HOLE A HOLLOW DRILL STEM MOUNTING A DRILL BIT AT ITS LOWER END, THE DRILL STEM IN THE BORE HOLE PROVIDING TWO PASSAGES BETWEEN THE VICINITY OF THE BIT AND THE SURFACE OF THE EARTH, AT LEAST ONE OF SAID PASSAGES EXTENDING THROUGH THE DRILL STEM, EFFECTING DRILLING BY SAID DRILL STEM WHILE PROVIDING A GAS UNDER PRESSURE THROUGH ONE OF SAID PASSAGES DOWNWARDLY TO THE VICINITY OF THE BIT TO EFFECT REMOVAL OF CUTTINGS THROUGH THE OTHER OF SAID PASSAGES, AND, AT LEAST DUR-
Claim 2
Independent Claim
120 words
THE METHOD OF DRILLING A DEEP BORE HOLE DOWNWARDLY INTO THE EARTH AT A LOCATION WHEREIN THE BORE HOLE PENETRATES A STRATUM FROM WHICH WATER WILL ENTER THE BORE HOLE, COMPRISING LOWERING INTO THE BORE HOLE A HOLLOW DRILL STEM MOUNTING A DRILL BIT AT ITS LOWER END, THE DRILL STEM IN THE BORE HOLE PROVIDING TWO PASSAGES BETWEEN THE VICINITY OF THE BIT AND THE SURFACE OF THE EARTH, AT LEAST ONE OF SAID PASSAGES EXTENDING THROUGH THE DRILL STEM, EFFECTING DRILLING BY SAID DRILL STEM WHILE PROVIDING A GAS UNDER PRESSURE THROUGH ONE OF SAID PASSAGES DOWNWARDLY TO THE VICINITY OF THE BIT TO EFFECT REMOVAL OF CUTTINGS THROUGH THE OTHER OF SAID PASSAGES, AND, AT LEAST DUR-
References Cited (Backward Citations)
GB378318A
Cited
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 |