US3428122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fluids by consolidation of earth fractures
Assignee: Shell USA Inc
•
Filing: 1966-11-25
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Granted: 1969-02-18
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Expires: 1986-11-25
Abstract
No abstract record available.
Inventors
- 👤 Norbert E Methven
- 👤 Edwin A Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:21
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; C; C09; C09K; C09K8/00; C09K8/56; C09K8/60; C09K8/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3100527A
Cited
US3297086A
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US3176767A
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US3297087A
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US3343600A
Cited
US3176769A
Cited
US3302718A
Cited
US3339633A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |