US3038854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent dewaxing
Assignee: Texaco Development Corp
•
Filing: 1959-02-09
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Granted: 1962-06-12
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Expires: 1979-02-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Wynkoop Kiersted
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:03
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD OF SOLVENT DEWAXING A WAXY PETROLEUM FRACTION WHICH COMPRISES COOLING A WAXY PETROLEUM FRACTION IN THE SUBSTANTIAL ABSENCE OF DEWAXING SOLVENT TO A TEMPERATURE IN THE RANGE 0 TO 10 DEGREES FAHRENHEIT ABOVE THE CLOUD POINT OF SAID PETROLEUM FRACTION, SHOCK CHILLING THE RESULTING COOLED PETROLEUM FRACTION BY ADMIXING THEREWITH COLD DEWAXING SOLVENT EFFECTING SUBSTANTIALLY INSTANTANEOUS COOLING OF THE RESULTING MIXTURE TO A TEMPERATURE IN THE RANGE 10-50 DEGREES FAHRENHEIT BELOW THE POINT OF SAID PETROLEUM FRACTION, AND SUBSEQUENTLY COOLING THE RESULTING ADMIXTURE TO A DEWAXING TEMPERATURE AND SEPARATING BY FILTRATION THE RESULTING PRECIPITATED WAX FROM SAID ADMIXTURE.
Claim 2
Independent Claim
100 words
A METHOD OF SOLVENT DEWAXING A WAXY PETROLEUM FRACTION WHICH COMPRISES COOLING A WAXY PETROLEUM FRACTION IN THE SUBSTANTIAL ABSENCE OF DEWAXING SOLVENT TO A TEMPERATURE IN THE RANGE 0 TO 10 DEGREES FAHRENHEIT ABOVE THE CLOUD POINT OF SAID PETROLEUM FRACTION, SHOCK CHILLING THE RESULTING COOLED PETROLEUM FRACTION BY ADMIXING THEREWITH COLD DEWAXING SOLVENT EFFECTING SUBSTANTIALLY INSTANTANEOUS COOLING OF THE RESULTING MIXTURE TO A TEMPERATURE IN THE RANGE 10-50 DEGREES FAHRENHEIT BELOW THE POINT OF SAID PETROLEUM FRACTION, AND SUBSEQUENTLY COOLING THE RESULTING ADMIXTURE TO A DEWAXING TEMPERATURE AND SEPARATING BY FILTRATION THE RESULTING PRECIPITATED WAX FROM SAID ADMIXTURE.
References Cited (Backward Citations)
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Cited
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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) | 1965-06-11 | 1965-12-11 | 1966-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-11 | 1969-12-11 | 1970-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-11 | 1973-12-11 | 1974-06-12 | $7700.00 | Window Closed / Lapsed |