Patent US3266835A successfully refreshed from Google Patents.
US3266835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Core barrel latch and by-pass assembly
Assignee: Boyles Bros Drilling Co Ltd
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Filing: 1963-12-18
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Granted: 1966-08-16
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Expires: 1983-12-18
Abstract
No abstract record available.
Inventors
- 👤 Perry B Hall
- 👤 James W Smyth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:45
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A CORE BARREL, A SPEARHEAD ASSEMBLY FOR MOVEMENT IN AN OUTER TUBULAR ARRANGEMENT COMPRISING A SLEEVE ADAPTED TO MOVE WITHIN AND AXIALLY OF AN OUTER TUBULAR ARRANGEMENT, A SPEARHEAD PROJECTING FROM AN END OF SAID SLEEVE AND HAVING A ROD SLIDABLY EXTENDING LONGITUDINALLY OF THE SLEEVE, A TUBULAR SPRING LATCH COMPLETELY SURROUNDING THE SLEEVE, AND MOVABLE LONGITUDINALLY THEREOF, SAID LATCH HAVING SPRING FINGERS AROUND THE SLEEVE EXTENDING TOWARDS THE SPEARHEAD END OF SAID SLEEVE, AND MEANS CONNECTED TO THE SPEARHEAD ROD AND ENGAGING THE SPRING FINGERS TO CAUSE SAID FINGERS TO MOVE OUTWARDLY INTO LOCKING POSITION AND INWARDLY TO UNLOCKING POSITION UPON MOVEMENT OF THE SPEARHEAD INWARDLY AND OUTWARDLY RESPECTIVELY RELATIVE TO SAID SLEEVE.
Claim 2
Dependent Claim
115 words
IN A CORE BARREL, A SPEARHEAD ASSEMBLY FOR MOVEMENT IN AN OUTER TUBULAR ARRANGEMENT COMPRISING A SLEEVE ADAPTED TO MOVE WITHIN AND AXIALLY OF AN OUTER TUBULAR ARRANGEMENT, A SPEARHEAD PROJECTING FROM AN END OF SAID SLEEVE AND HAVING A ROD SLIDABLY EXTENDING LONGITUDINALLY OF THE SLEEVE, A TUBULAR SPRING LATCH COMPLETELY SURROUNDING THE SLEEVE, AND MOVABLE LONGITUDINALLY THEREOF, SAID LATCH HAVING SPRING FINGERS AROUND THE SLEEVE EXTENDING TOWARDS THE SPEARHEAD END OF SAID SLEEVE, AND MEANS CONNECTED TO THE SPEARHEAD ROD AND ENGAGING THE SPRING FINGERS TO CAUSE SAID FINGERS TO MOVE OUTWARDLY INTO LOCKING POSITION AND INWARDLY TO UNLOCKING POSITION UPON MOVEMENT OF THE SPEARHEAD INWARDLY AND OUTWARDLY RESPECTIVELY RELATIVE TO SAID SLEEVE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |