Patent US2911047A successfully refreshed from Google Patents.
US2911047A
Expired / Lapsed
US
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Apparatus for extracting naturally occurring difficultly flowable petroleum oil from a naturally located subterranean body
Assignee: Individual
•
Filing: 1958-03-11
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Granted: 1959-11-03
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Expires: 1978-03-11
Abstract
No abstract record available.
Inventors
- 👤 John C Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:00
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/006
Claims Analysis
Total Claims: 0
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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) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |