US2766828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fracturing subsurface formations and well stimulation
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1953-07-20
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Granted: 1956-10-16
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Expires: 1973-07-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Henry H Rachford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:17
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/263; C; C06; C06B; C06B25/00; C06B25/18; C06B25/20; C06B43/00; C09; C09K; C09K8/00; C09K8/60; C09K8/62
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) | 1959-10-16 | 1960-04-16 | 1960-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-16 | 1964-04-16 | 1964-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-16 | 1968-04-16 | 1968-10-16 | $7700.00 | Window Closed / Lapsed |