Patent US3368620A successfully refreshed from Google Patents.
US3368620A
Expired / Lapsed
US
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Oil recovery process
Assignee: Phillips Petroleum Co
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Filing: 1965-06-18
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Granted: 1968-02-13
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Expires: 1985-06-18
Abstract
No abstract record available.
Inventors
- 👤 Robert R Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:02
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/584; C09K8/60; C09K8/602; C09K8/92; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
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) | 1971-02-12 | 1971-08-14 | 1972-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-12 | 1975-08-14 | 1976-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-12 | 1979-08-14 | 1980-02-13 | $7700.00 | Window Closed / Lapsed |