Patent US2678982A successfully refreshed from Google Patents.
US3481401A
Expired / Lapsed
US
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Self-bridging fractures
Assignee: ExxonMobil Upstream Research Co
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Filing: 1968-01-25
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Granted: 1969-12-02
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Expires: 1988-01-25
Abstract
No abstract record available.
Inventors
- 👤 John W Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:22
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/267; C; C09; C09K; C09K8/00; C09K8/60; C09K8/62; C09K8/72; C09K8/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3239006A
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US3285340A
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US3237693A
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US3266573A
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US3242988A
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US3376930A
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US3387888A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |