US3769199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating waxy hydrocarbons
Assignee: BP PLC
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Filing: 1971-06-23
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Granted: 1973-10-30
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Expires: 1991-06-23
Abstract
Abstract WAXY HYDROCARBONS ARE ADSORBED FROM PETROLEUM OILS BOILING ABOVE 30*C. USING AS ADSORBENT A GRAPHIC CARBON PREPARED BY THE PARTIAL OXIDATION OF A HYDROCARBON SO THAT NOT MORE THAN 10% OF THE CARBON IS RELEASED AS ELEMENTAL CARBON, THE GRAPHITIC CARBON HAVING A RATIO OF HEAT OF ADSORPTION OF N-DOTRIACONTANE FROM N-HEPTANE OF AT LEAST 3.5:1 AND A HEAT OF ADSORPTION OF N-DOTRIACONTANE OF AT LEAST 1 CALORIE PER GRAM.
Inventors
- 👤 A Groszek
- 👤 D Nicholas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:30
CPC Classifications
C; C01; C01B; C01B32/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |