US3353609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill stem testing apparatus
Assignee: Johnston Testers Ltd
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Filing: 1965-06-21
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Granted: 1967-11-21
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Expires: 1985-06-21
Abstract
No abstract record available.
Inventors
- 👤 Jensen Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:13
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
DRILL STEM TESTING APPARATUS FOR USE IN A WEEL BORE INCLUDING A SAMPLE-RECEIVING CHAMBER FORMED BY A STRING OF PIPE, A LOWER VALVE SELECTIVELY OPERABLE IN RESPONSE TO MANIPULATION OF THE STRING OF PIPE IN A WELL BORE, AN UPPER VALVE IN SAID STRING OF PIPE BELOW THE UPPER END OF THE WELL BORE, SAID UPPER VALVE BEING SELECTIVELY OPERABLE IN RESPONSE TO EXTERNAL CONTROL MEANS, AND AN INTERMEDIATE VALVE LOCATED JUST ABOVE SAID LOWER VALVE AND SELECTIVELY OPERABLE IN RESPONSE TO MEANS WITHIN SAID STRING OF PIPE.
Claim 2
Dependent Claim
88 words
DRILL STEM TESTING APPARATUS FOR USE IN A WEEL BORE INCLUDING A SAMPLE-RECEIVING CHAMBER FORMED BY A STRING OF PIPE, A LOWER VALVE SELECTIVELY OPERABLE IN RESPONSE TO MANIPULATION OF THE STRING OF PIPE IN A WELL BORE, AN UPPER VALVE IN SAID STRING OF PIPE BELOW THE UPPER END OF THE WELL BORE, SAID UPPER VALVE BEING SELECTIVELY OPERABLE IN RESPONSE TO EXTERNAL CONTROL MEANS, AND AN INTERMEDIATE VALVE LOCATED JUST ABOVE SAID LOWER VALVE AND SELECTIVELY OPERABLE IN RESPONSE TO MEANS WITHIN SAID STRING OF PIPE.
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) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |