US3726653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric pour point depressant for residual fuels
Assignee: Shell USA Inc
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Filing: 1970-12-14
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Granted: 1973-04-10
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Expires: 1990-12-14
Abstract
Abstract WAX-CONTAINING CRUDE OILS AND RESIDUAL FUELS CONTAINING, AS A POUR POINT DEPRESSANT, A MIXTURE OF OIL SOLUBLE POLYMERS OF OLEFINICALLY UNSATURATED MONOMERS HAVING ALIPHATIC HYDROCARBON SIDE CHAINS WITH AT LEAST 14 CARBON ATOMS AND OIL SOLUBLE COPOLYMERS OF ETHYLENE AND AN OLEFINICALLY UNSATURATED ALIPHATIC MONOMER HAVING FROM 3 TO 5 CARBON ATOMS PER MOLECULE HAVE IMPROVED POUR POINT CHARACTERISTICS.
Inventors
- 👤 Der Meij P Van
- 👤 R Bloembergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:12
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/146; C10L1/16; C10L1/1625; C10L1/1633; C10L1/1641; C10L1/1658; C10L1/18; C10L1/192; C10L1/195; C10L1/1955; C10L1/196; C10L1/1963; C10L1/1966; C10L1/197; C10L1/1973; C10L1/22; C10L1/234; C10L1/236; C10L1/2362; C10L1/2364; C10L1/26; C10L1/2666; C10L1/2675
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |