US3277972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock drilling equipment
Assignee: Atlas Copco AB
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Filing: 1963-07-09
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Granted: 1966-10-11
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Expires: 1983-07-09
Abstract
No abstract record available.
Inventors
- 👤 Lagerstrom Gunnar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:44
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN DRILLING APPARATUS OF THE CHARACTER DESCRIBED HAVING A TUBULAR CASING AND DRILL ROD MEANS INCLUDING A DRILL BIT DISPOSED AT ONE END THEREOF FOR MOVEMENT AXIALLY THROUGH AND BEYOND SAID CASING, THE COMBINATION WHICH COMPRISES GUIDING MEANS DISPOSED IN SAID CASING SUBSTANTIALLY ADJACENT THE END THEREOF NEAREST SAID DRILL BIT FOR COOPERATING SLIDING ENGAGEMENT AT ONE AXIAL POSITION OF SAID DRILL ROD MEANS IN SAID CASING FOR MAINTAINING SAID DRILL ROD MEANS AND SAID DRILL BIT OFFSET THE AXIS OF SAID CASING, SAID GUIDING MEANS FORMING A CONSTRICTION WITHIN
Claim 2
Dependent Claim
90 words
IN DRILLING APPARATUS OF THE CHARACTER DESCRIBED HAVING A TUBULAR CASING AND DRILL ROD MEANS INCLUDING A DRILL BIT DISPOSED AT ONE END THEREOF FOR MOVEMENT AXIALLY THROUGH AND BEYOND SAID CASING, THE COMBINATION WHICH COMPRISES GUIDING MEANS DISPOSED IN SAID CASING SUBSTANTIALLY ADJACENT THE END THEREOF NEAREST SAID DRILL BIT FOR COOPERATING SLIDING ENGAGEMENT AT ONE AXIAL POSITION OF SAID DRILL ROD MEANS IN SAID CASING FOR MAINTAINING SAID DRILL ROD MEANS AND SAID DRILL BIT OFFSET THE AXIS OF SAID CASING, SAID GUIDING MEANS FORMING A CONSTRICTION WITHIN
References Cited (Backward Citations)
US654981A
Cited
US2620166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |