Patent US2649384A successfully refreshed from Google Patents.
US2649384A
Expired / Lapsed
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Asphalt composition and process of preparing the same
Assignee: Shell Development Co
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Filing: 1950-05-15
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Granted: 1953-08-18
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Expires: 1970-05-15
Abstract
No abstract record available.
Inventors
- 👤 Alvin P Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:35
CPC Classifications
C; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
AN ASPHALT BLOWING FLUX CONSISTING ESSENTIALLY OF AN ASPHALTIC RESIDUE HAVING A RING AND BALL SOFTENING POINT BETWEEN 70 AND 120* F., AND 5-20% BY WEIGHT OF SAID FLUX OF A ''''SOFT WAX'''' FRACTION, SAID FRACTION COMPRISING 13-40% BY WEIGHT OF BRIGHT STOCK LUBRICATING OIL HAVING A VISCOSITY OF AT LEAST 100 SECONDS SAYBOLT UNIVERSAL AT 210* F. OBTAINABLE FROM A WAXY PETROLEUM SHORT RESIDUE AND 60-87% BY WEIGHT OF MICROCRYSTALLINE WAX, SAID WAX BEING COMPRISED PREDOMINATELY OF MICROCRYSTALLINE WAX-TYPE HYDROCARBONS INDIVIDUALLY MELTING BETWEEN - 18* AND 40* C.
References Cited (Backward Citations)
US1396527A
Cited
US2291905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |