Patent US3481865A successfully refreshed from Google Patents.
US3481865A
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Removal of impurities from aromatic oils and tars
Assignee: Phillips Petroleum Co
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Filing: 1966-09-26
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Granted: 1969-12-02
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Expires: 1986-09-26
Abstract
No abstract record available.
Inventors
- 👤 Sherwood C Samuels Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:22
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/003; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C10G21/06; C10G21/12; C10G21/14; C01; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2899373A
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US2895902A
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US2846358A
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US2906693A
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US3167500A
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US3281350A
Cited
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 |