Patent US1904388A successfully refreshed from Google Patents.
Patent US2726192A successfully refreshed from Google Patents.
US2726192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction and fractionation of petroleum resins with n-butanol
Assignee: Atlantic Richfield Co
•
Filing: 1952-10-09
•
Granted: 1955-12-06
•
Expires: 1972-10-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph A Kieras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:29
CPC Classifications
C; C08; C08L; C08L57/00; C08L57/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
76 words
THE METHOD OF PRODUCING A VARIETY OF PETROLEUM RESINS WHICH COMPRSES CONTACTING A PROPANE PRECIPITATED ASPHALT FRACTION WITH N-BUTANOL IN AN EXTRACTION ZONE, REMOVING A FRACTION OF PROPANE PRECIPITATED ASPHALT WHICH HAS BEEN AT LEAST PARTIALLY STRIPPED OF PETROLEUM RESINS, AND SEPARATING FROM THE REMAINING N-BUTANOL SOLUTION OF EXTRACTED RESINS A PLURALITY OF PETROLEUM RESIN FRACTIONS BY PROGRESSIVELY DECREASING THE TEMPERATURE OF SAID N-BUTANOL SOLUTION OF PETROLEUM RESINS FROM ABOUT 240* F. TO ABOUT ROOM TEMPERATURE.
Claim 2
Independent Claim
76 words
THE METHOD OF PRODUCING A VARIETY OF PETROLEUM RESINS WHICH COMPRSES CONTACTING A PROPANE PRECIPITATED ASPHALT FRACTION WITH N-BUTANOL IN AN EXTRACTION ZONE, REMOVING A FRACTION OF PROPANE PRECIPITATED ASPHALT WHICH HAS BEEN AT LEAST PARTIALLY STRIPPED OF PETROLEUM RESINS, AND SEPARATING FROM THE REMAINING N-BUTANOL SOLUTION OF EXTRACTED RESINS A PLURALITY OF PETROLEUM RESIN FRACTIONS BY PROGRESSIVELY DECREASING THE TEMPERATURE OF SAID N-BUTANOL SOLUTION OF PETROLEUM RESINS FROM ABOUT 240* F. TO ABOUT ROOM TEMPERATURE.
Claim 3
Dependent Claim
46 words
PETROLEUM RESINS PREPARED ACCORDING TO THE METHOD OF CLAIM 1, RANGING BETWEEN 400 AND 1200 IN MOLECULAR WEIGHT, 60* F. AND 200* F. IN ASTM (D36-26) RING AND BALL SOFTENING POINT, 1.4900 AND 1.6200 IN REFRACTIVE INDEX ND AT 176* F., AND 0.9900 AND 1.0600 IN
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) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |