US3769246A
Expired / Lapsed
US
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Methods for modifying asphalts and emulsions useful therefor
Assignee: Phillips Petroleum Co
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Filing: 1971-05-10
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Granted: 1973-10-30
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Expires: 1991-05-10
Abstract
Abstract THIS INVENTION RELATES TO THE IMPROVEMENT OF THE RHEOLOGICAL PROPERTIES OF ASPHALTS IN ADDITION TO THE DURABILITY OF ASPHALTS BY MODIFICATION OF THE ASPHALTENES FRACTION AND/OR THE MALTENES FRACTION OF AN ASPHALT BY ADDING THERETO ELASTOMERS. THIS MAY BE ACCOMPLISHED BY ADDING EITHER AN N-PENTANE-SOLUBLE POLYMER OR AN N-PENTANEINSOLUBLE POLYMER OR A MIXTURE OF THE TWO.
Inventors
- 👤 F Rostler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
E; E01; E01C; E01C7/00; E01C7/08; E01C7/35; E01C7/355; C; C08; C08L; C08L53/00; C08L53/02; C08L95/00; C10; C10C; C10C3/00; C10C3/02; C10C3/026; E01C7/18; E01C7/26; E01C7/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |