Patent US2503881A successfully refreshed from Google Patents.
US2665759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for completing multiple production zone well bores
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1948-12-27
•
Granted: 1954-01-12
•
Expires: 1968-12-27
Abstract
No abstract record available.
Inventors
- 👤 Roscoe O Childers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:56
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2189701A
Cited
US2277380A
Cited
US2403987A
Cited
US2380022A
Cited
US2368428A
Cited
US2537066A
Cited
US2465344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |