US3645945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt composition
Assignee: Texaco Inc
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Filing: 1967-02-15
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Granted: 1972-02-29
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Expires: 1987-02-15
Abstract
Abstract THE DUCTILITY AND THE ELASTICITY OF AN ASPHALT COMPOSITION IS IMPROVED BY THE IN SITU OFORMATION THEREIN OF A POLYURETHANE POLYMER FROM ADDED POLYOL AND ORGANIC POLYISOCYANATE COMPONENTS. THESE REULTANT IMPROVED ASPHALT COMPOSITIONS ARE DESIRABLE FOR PAVING SURFACES, ROOFING APPLICATIONS, SOIL STABILIZATION, SEALANTS AND OTHER APPLICATIONS WHEREIN ELASTICITY AND DUCTILITY ARE IMPORTANT. THE IMPROVED ASPHALT COMPOISTION EXHIBITS EXCELLENT HEAT STABILITY AFTER BEING HELD AT HIGH TEMPERATURES FOR AN EXTENDED PERIOD OF TIME.
Inventors
- 👤 Sherman D Lesesne
- 👤 George P Speranza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:26
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/28; C08G18/40; C08G18/64; C08G18/6476; C08L; C08L95/00
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |