Patent US3307641A successfully refreshed from Google Patents.
US3307641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-excited hammer drill
Assignee: ExxonMobil Upstream Research Co
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Filing: 1963-09-23
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Granted: 1967-03-07
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Expires: 1983-09-23
Abstract
No abstract record available.
Inventors
- 👤 Jr John H Wiggins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:13
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
A PERCUSSIVE FORCE GENERATOR ADAPTED FOR RIGID CONNECTION IN A ROTARY DRILL STRING, COMPRISING TWO SUBSTANTIALLY COAXIAL TUBULAR WALLS FORMING A CLOSED ANNULAR CHAMBER, ANVIL MEANS AT THE LOWER END OF SAID CHAMBER, SPRING MEANS WITHIN SAID CHAMBER, AND HAMMER MEANS SUSPENDED BY SAID SPRING MEANS WITHIN SAID CHAMBER IN A POSITION TO STRIKE SAID ANVIL MEANS, SAID CHAMBER BEING FREE OF ANY OBSTRUCTION TO A RESONANT ACTION OF SAID SPRING AND HAMMER.
Claim 2
Dependent Claim
73 words
A PERCUSSIVE FORCE GENERATOR ADAPTED FOR RIGID CONNECTION IN A ROTARY DRILL STRING, COMPRISING TWO SUBSTANTIALLY COAXIAL TUBULAR WALLS FORMING A CLOSED ANNULAR CHAMBER, ANVIL MEANS AT THE LOWER END OF SAID CHAMBER, SPRING MEANS WITHIN SAID CHAMBER, AND HAMMER MEANS SUSPENDED BY SAID SPRING MEANS WITHIN SAID CHAMBER IN A POSITION TO STRIKE SAID ANVIL MEANS, SAID CHAMBER BEING FREE OF ANY OBSTRUCTION TO A RESONANT ACTION OF SAID SPRING AND HAMMER.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |