US3483923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil recovery using combination oilwetting and acidizing treatments
Assignee: Shell USA Inc
•
Filing: 1968-03-29
•
Granted: 1969-12-16
•
Expires: 1988-03-29
Abstract
No abstract record available.
Inventors
- 👤 Henry C H Darley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:04
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2689009A
Cited
US2802531A
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US2852077A
Cited
US3208517A
Cited
US3288213A
Cited
US3343602A
Cited
US3353593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-15 | 1973-06-16 | 1973-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-15 | 1977-06-16 | 1977-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-15 | 1981-06-16 | 1981-12-16 | $7700.00 | Window Closed / Lapsed |