US3318387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drilling method and apparatus
Assignee: Chevron USA Inc
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Filing: 1964-09-28
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Granted: 1967-05-09
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Expires: 1984-09-28
Abstract
No abstract record available.
Inventors
- 👤 Harold W Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:10
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
APPARATUS FOR USE DURING OPERATIONS IN A WELL COMPRISING A FLAPPER VALVE MEANS HAVING A CENTRAL OPENING, A FLAP ADAPTED TO OPEN DOWNWARDLY COVERING SAID OPENING, MEANS FOR MOUNTING SAID FLAPPER VALVE MEANS IN A DRILL STRING, A WIRE LINE TOOL OF SMALLER DIAMETER THAN THE OPENING IN SAID FLAPPER VALVE MEANS, LUG MEANS ON THE EXTERIOR OF SAID TOOL, MEANS A SLEEVE ARRANGED AROUND SAID TOOL, SAID FISHING TOOL BEING FREELY MOVABLE WITHIN SAID SLEEVE AND THE SAID SLEEVE BEING INSERTABLE INTO THE OPENING OF SAID FLAPPER VALVE MEANS, SHOULDER MEANS ON THE UPPER END OF SAID SLEEVE CONTACTABLE WITH THE LUG MEANS ON SAID TOOL FOR HANGING SAID SLEEVE ON SAID TOOL, FLANGE MEANS ON THE UPPER END OF SAID SLEEVE WHICH WILL NOT PASS THROUGH THE OPENING IN SAID FLAPPER VALVE MEANS, AND MEANS FOR RUNNING SAID TOOL AND SAID SLEEVE CARRIED THEREON INTO THE DRILL STRING AND THROUGH THE OPENING IN SAID FLAPPER VALVE.
Claim 2
Dependent Claim
158 words
APPARATUS FOR USE DURING OPERATIONS IN A WELL COMPRISING A FLAPPER VALVE MEANS HAVING A CENTRAL OPENING, A FLAP ADAPTED TO OPEN DOWNWARDLY COVERING SAID OPENING, MEANS FOR MOUNTING SAID FLAPPER VALVE MEANS IN A DRILL STRING, A WIRE LINE TOOL OF SMALLER DIAMETER THAN THE OPENING IN SAID FLAPPER VALVE MEANS, LUG MEANS ON THE EXTERIOR OF SAID TOOL, MEANS A SLEEVE ARRANGED AROUND SAID TOOL, SAID FISHING TOOL BEING FREELY MOVABLE WITHIN SAID SLEEVE AND THE SAID SLEEVE BEING INSERTABLE INTO THE OPENING OF SAID FLAPPER VALVE MEANS, SHOULDER MEANS ON THE UPPER END OF SAID SLEEVE CONTACTABLE WITH THE LUG MEANS ON SAID TOOL FOR HANGING SAID SLEEVE ON SAID TOOL, FLANGE MEANS ON THE UPPER END OF SAID SLEEVE WHICH WILL NOT PASS THROUGH THE OPENING IN SAID FLAPPER VALVE MEANS, AND MEANS FOR RUNNING SAID TOOL AND SAID SLEEVE CARRIED THEREON INTO THE DRILL STRING AND THROUGH THE OPENING IN SAID FLAPPER VALVE.
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) | 1970-05-08 | 1970-11-07 | 1971-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-08 | 1974-11-07 | 1975-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-08 | 1978-11-07 | 1979-05-09 | $7700.00 | Window Closed / Lapsed |