Patent US2931766A successfully refreshed from Google Patents.
US2931766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the color of a petroleum resin by hydrofining
Assignee: Sinclair Refining Co
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Filing: 1955-12-21
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Granted: 1960-04-05
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Expires: 1975-12-21
Abstract
No abstract record available.
Inventors
- 👤 Maurice K Rausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:38
CPC Classifications
C; C10; C10G; C10G67/00; C10G67/02; C10G67/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A METHOD FOR PRODUCING AROMATIC RESINOUS FRACTIONS OF IMPROVED COLOR AND COLOR STABILITY WITHOUT SUBSTANTIALLY DECREASING THE AROMATICITY OF SAID FRACTIONS WHICH COMPRISES PROPANE DEASPHALTING A HEAVY ASPHALTIC PETROLEUM RESIDUAL, SOLVENT EXTRACTING THE DEASPHALTED RESIDUAL WITH A SOLVENT HAVING A SELECTIVITY FOR AROMATICS TO OBTAIN AN AROMATIC RESINOUS FRACTION HAVING AN API GRAVITY BELOW ABOUT 15.0 AND A VISCOSITY OF ABOUT 400 TO 15,000 SUS AT 210*F., PASSING SAID AROMATIC FRACTION IN ADMIXTURE WITH HYDROGEN INTO CONTACT WITH A HYDROGENATION CATALYST UNDER A TEMPERATURE FROM ABOUT 500* TO 800*F., A PRESSURE WITHIN THE RANGE OF ABOUT 200 TO 1000 P.S.I.G., A WEIGHT HOURLY SPACE VELOCITY WITHIN THE RANGE OF ABOUT 0.5 TO 10 AND EMPLOYING A HYDROGEN RECYCLE RATIO WITHIN THE RANGE OF ABOUT 200 TO 10,000 STANDARD CUBIC FEET PER BARREL.
Claim 2
Independent Claim
132 words
A METHOD FOR PRODUCING AROMATIC RESINOUS FRACTIONS OF IMPROVED COLOR AND COLOR STABILITY WITHOUT SUBSTANTIALLY DECREASING THE AROMATICITY OF SAID FRACTIONS WHICH COMPRISES PROPANE DEASPHALTING A HEAVY ASPHALTIC PETROLEUM RESIDUAL, SOLVENT EXTRACTING THE DEASPHALTED RESIDUAL WITH A SOLVENT HAVING A SELECTIVITY FOR AROMATICS TO OBTAIN AN AROMATIC RESINOUS FRACTION HAVING AN API GRAVITY BELOW ABOUT 15.0 AND A VISCOSITY OF ABOUT 400 TO 15,000 SUS AT 210*F., PASSING SAID AROMATIC FRACTION IN ADMIXTURE WITH HYDROGEN INTO CONTACT WITH A HYDROGENATION CATALYST UNDER A TEMPERATURE FROM ABOUT 500* TO 800*F., A PRESSURE WITHIN THE RANGE OF ABOUT 200 TO 1000 P.S.I.G., A WEIGHT HOURLY SPACE VELOCITY WITHIN THE RANGE OF ABOUT 0.5 TO 10 AND EMPLOYING A HYDROGEN RECYCLE RATIO WITHIN THE RANGE OF ABOUT 200 TO 10,000 STANDARD CUBIC FEET PER BARREL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |