Patent US2740477A successfully refreshed from Google Patents.
US2740477A
Expired / Lapsed
US
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Apparatus for obtaining fluid samples from subterranean formations
Assignee: Individual
•
Filing: 1951-10-29
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Granted: 1956-04-03
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Expires: 1971-10-29
Abstract
No abstract record available.
Inventors
- 👤 Richard J Monaghan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:36
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A RETRIEVABLE DEVICE FOR LOWERING THROUGH A DRILL STRING DURING DRILLING OPERATIONS FOR OBTAINING SAMPLES OR SPECIMENS OF FLUID FROM THE FORMATION BELOW THE BOTTOM OF AN OIL WELL, COMPRISING A PAIR OF SLIDABLY CONNECTED MEMBERS, ONE MEMBER CARRYING A SHAPED CHARGE AND A DETONATOR, THE OTHER MEMBER HAVING A FIRING PIN IN COOPERATIVE RELATION WITH THE DETONATOR AND HAVING A LONGITUDINAL BORE OPEN AT OPPOSITE ENDS, SAID FIRING PIN BEING MOUNTED ON SAID OTHER MEMBER FOR PROJECTION BELOW THE
Claim 2
Dependent Claim
80 words
A RETRIEVABLE DEVICE FOR LOWERING THROUGH A DRILL STRING DURING DRILLING OPERATIONS FOR OBTAINING SAMPLES OR SPECIMENS OF FLUID FROM THE FORMATION BELOW THE BOTTOM OF AN OIL WELL, COMPRISING A PAIR OF SLIDABLY CONNECTED MEMBERS, ONE MEMBER CARRYING A SHAPED CHARGE AND A DETONATOR, THE OTHER MEMBER HAVING A FIRING PIN IN COOPERATIVE RELATION WITH THE DETONATOR AND HAVING A LONGITUDINAL BORE OPEN AT OPPOSITE ENDS, SAID FIRING PIN BEING MOUNTED ON SAID OTHER MEMBER FOR PROJECTION BELOW THE
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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) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |