Patent US2862868A successfully refreshed from Google Patents.
US2862868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of low cold-test oils
Assignee: —
•
Filing: —
•
Granted: 1958-12-02
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Expires: 1975-12-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:24
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/24; C10M; C10M177/00; C10G2400/00; C10G2400/10; C10N; C10N2070/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
83 words
A METHOD FOR DEWAXING A WAX-CONTAINING HYDROCARBON OIL HAVING A VISCOSITY BETWEEN ABOUT 40 AND 300 SSU AT 100*F. AND A POUR POINT BETWEEN ABOUT 0 AND 100*F. AND OBTAINING A LOW COLD-TEST OIL THEREFROM HAVING A POUR POINT IN THE RANGE OF ABOUT -10 TO-70*F., WHICH COMPRISES CONTACTING SAID OIL WITH SOLID UREA UNDER UREA-ADDUCT FORMING CONDITIONS IN THE PRESENCE OF BETWEEN ABOUT 0.05 AND 0.5 MOLE OF METHANOL PER MOLE OF UREA AND BETWEEN ABOUT 2 AND 10 VOLUME-PERCENT OF WATER
References Cited (Backward Citations)
US2663671A
Cited
US2672457A
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US2681335A
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US2731456A
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US2731455A
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US2661317A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |