Patent US2904494A successfully refreshed from Google Patents.
US2904494A
Expired / Lapsed
US
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Process for the preparation of age resistant asphalt compositions
Assignee: Shell Development Co
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Filing: 1955-08-15
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Granted: 1959-09-15
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Expires: 1975-08-15
Abstract
No abstract record available.
Inventors
- 👤 Raymond L Griffin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:04
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/005
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
60 words
AN ASPHALT COMPOSITION COMPRISING A RESIDUAL ASPHALT HAVING A PENETRATION AT 77* F. LESS THAN 10 AND A CUTTER STOCK COMPRISING PETROLEUM HYDROCARBONS IN AN AMOUNT BETWEEN ABOUT 40 AND 9/%, SAID CUTTER STOCK BEING AN ASPHALTIC OIL HAVING MOLECULAR WEIGHTS BETWEEN ABOUT 400 AND 800, SAID ASPHALT COMPOSITION CONTAINING SUBSTANTIALLY NO COMPONENTS HAVING MOLECULAR WEIGHS LESS THAN ABOUT 400.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |