US2731455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pour point reduction of petroleum oil
Assignee: —
•
Filing: —
•
Granted: 1956-01-17
•
Expires: 1973-01-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:25
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
METHOD FOR OBTAINING UREA ACTIVATED FOR PETROLEUM WAX-UREA COMPLEX FORMATION, WHICH COMPRISES SUBJECTING UREA AT LEAST TWICE TO THE CYCLE OF CONTACTING UREA WITH A WAX BEARING PETROLEUM OIL FRACTION TO THEREBY OBTAIN A COMPLEX BETWEEN SAID UREA AND WAX IN SAID FRACTION, INTIMATELY CONTACTING THE RESULTING COMPLEX WITH A PETROLEUM OIL FRACTION OF THE KEROSENE RANGE IN AMOUNT NORMALLY SUFFICIENT TO FORM A SOLUTION OF THE AMOUNT OF WAX CARRIED BY SAID UREA COMPLEX, AT A TEMPERATURE NOT APPRECIABLY LESS THAN 165* F. AND IN THE PRESENCE OF ABOUT 1/4-5% OF WATER BY WEIGHT OF UREA, AND SEPARATING THE RESULTING UREA SUBSTANCE.
Claim 2
Dependent Claim
103 words
METHOD FOR OBTAINING UREA ACTIVATED FOR PETROLEUM WAX-UREA COMPLEX FORMATION, WHICH COMPRISES SUBJECTING UREA AT LEAST TWICE TO THE CYCLE OF CONTACTING UREA WITH A WAX BEARING PETROLEUM OIL FRACTION TO THEREBY OBTAIN A COMPLEX BETWEEN SAID UREA AND WAX IN SAID FRACTION, INTIMATELY CONTACTING THE RESULTING COMPLEX WITH A PETROLEUM OIL FRACTION OF THE KEROSENE RANGE IN AMOUNT NORMALLY SUFFICIENT TO FORM A SOLUTION OF THE AMOUNT OF WAX CARRIED BY SAID UREA COMPLEX, AT A TEMPERATURE NOT APPRECIABLY LESS THAN 165* F. AND IN THE PRESENCE OF ABOUT 1/4-5% OF WATER BY WEIGHT OF UREA, AND SEPARATING THE RESULTING UREA SUBSTANCE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |