US2988998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for producing high viscosity oils and loosely consolidated sands from low pressure reservoirs
Assignee: Individual
•
Filing: 1959-06-01
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Granted: 1961-06-20
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Expires: 1979-06-01
Abstract
No abstract record available.
Inventors
- 👤 Wilkinson Rudolph Purifoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:17
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/16
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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |