US3368876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating asphaltene coated watersoluble solids from an oil phase
Assignee: Shell USA Inc
•
Filing: 1965-06-21
•
Granted: 1968-02-13
•
Expires: 1985-06-21
Abstract
No abstract record available.
Inventors
- 👤 Jr William A Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:37
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/30; B01; B01D; B01D12/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1812629A
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US2070626A
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US2650931A
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US2729589A
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US2774722A
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US2853426A
Cited
US3153623A
Cited
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 |