Patent US3491834A successfully refreshed from Google Patents.
US3491834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surfactant injection process
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1967-09-19
•
Granted: 1970-01-27
•
Expires: 1987-09-19
Abstract
No abstract record available.
Inventors
- 👤 George P Ahearn
- 👤 Erik I Sandvik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:44
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3006411A
Cited
US3126952A
Cited
US2927637A
Cited
US3082822A
Cited
US3266570A
Cited
US3261399A
Cited
US3324944A
Cited
US3302713A
Cited
US3348611A
Cited
US3254714A
Cited
US3421582A
Cited
US3307628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |