US3371717A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple zone well production apparatus
Assignee: Baker Hughes Oilfield Operations LLC
•
Filing: 1965-09-21
•
Granted: 1968-03-05
•
Expires: 1985-09-21
Abstract
No abstract record available.
Inventors
- 👤 David V Chenoweth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:12
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2227539A
Cited
US2537066A
Cited
US2839144A
Cited
US3045759A
Cited
US2976931A
Cited
US3194312A
Cited
US3282341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |