Patent US3407878A successfully refreshed from Google Patents.
US3407878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lost circulation control
Assignee: Phillips Petroleum Co
•
Filing: 1966-09-02
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Granted: 1968-10-29
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Expires: 1986-09-02
Abstract
No abstract record available.
Inventors
- 👤 Charles J Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:50
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1460788A
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US2065512A
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US2042011A
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US3028913A
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US3175628A
Cited
US3190373A
Cited
US3342262A
Cited
US3323589A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |