US3171483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tools
Assignee: Otis Engineering Corp
•
Filing: 1956-04-16
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Granted: 1965-03-02
•
Expires: 1976-04-16
Abstract
No abstract record available.
Inventors
- 👤 John V Fredd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:13
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE METHOD OF COMPLETING A WELL HAVING TWO PRODUCING ZONES, INCLUDING: DISPOSING A PAIR OF TUBING STRINGS IN A WELL, SUCH TUBING STRINGS HAVING LOWER ENDS DISPOSED ABOVE THE UPPER PRODUCING ZONE; DISPOSING A NIPPLE BETWEEN THE TWO PRODUCING ZONES, SAID NIPPLE HAVING A PAIR OF PASSAGES PROVIDING COMMUNICATION BETWEEN THE TWO ZONES AND ALSO HAVING MEANS THEREON SELECTIVELY DETERMINING ENTRY OF WELL TOOLS INTO SAID PASSAGES; SELECTIVELY CLOSING A PREDETERMINED SELECTED ONE OF THE TWO PASSAGES; AND ESTABLISHING A FLOW COURSE SELECTIVELY CONNECTING THE OTHER PASSAGE TO A SELECTED ONE OF EITHER OF THE TWO TUBING
Claim 2
Independent Claim
97 words
THE METHOD OF COMPLETING A WELL HAVING TWO PRODUCING ZONES, INCLUDING: DISPOSING A PAIR OF TUBING STRINGS IN A WELL, SUCH TUBING STRINGS HAVING LOWER ENDS DISPOSED ABOVE THE UPPER PRODUCING ZONE; DISPOSING A NIPPLE BETWEEN THE TWO PRODUCING ZONES, SAID NIPPLE HAVING A PAIR OF PASSAGES PROVIDING COMMUNICATION BETWEEN THE TWO ZONES AND ALSO HAVING MEANS THEREON SELECTIVELY DETERMINING ENTRY OF WELL TOOLS INTO SAID PASSAGES; SELECTIVELY CLOSING A PREDETERMINED SELECTED ONE OF THE TWO PASSAGES; AND ESTABLISHING A FLOW COURSE SELECTIVELY CONNECTING THE OTHER PASSAGE TO A SELECTED ONE OF EITHER OF THE TWO TUBING
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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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |