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US2913389A
Expired / Lapsed
US
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Paving asphalt compositions
Assignee: Shell Development Co
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Filing: 1956-07-30
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Granted: 1959-11-17
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Expires: 1976-07-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Joseph J Heithaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:24
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
A PAVING GRADE ASPHALT COMPOSITION HAVING A VISCOSITY ACTIVATION ENERGY OF LESS THAN ABOUT 10 KILOCALORIES BETWEEN 77 AND 176* F., SAID COMPOSITION COMPRISING BETWEEN ABOUT 5% AND ABOUT 50% BY WEIGHT OF A BLOWN VACUUM FLASHER ASPHALT HAVING A PENETRATION AT 77* F. (100 G. LOAD 5 SECONDS) LESS THAN ABOUT 15 AND A RINGAND-BALL SOFTENING POINT ABOVE ABOUT 200*F., AND BETWEEN ABOUT 95% AND ABOUT 50% BY WEIGHT OF AN ASPHALT PRECIPITATED BY PROPANE ADDITION TO CAVUUM FLASHER SHORT RESIDUE, SAID PROPANE-PRECIPITATED ASPHALT HAVING A PENETRATION AT 7M* F. (100 G. LOAD, 5 SECONDS) GREATER THAN ABOUT 200 AND A RING-AND-BALL SOFTENING POINT BELOW ABOUT 125* F.
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) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |