US2848429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt compositions
Assignee: Shell Development Co
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Filing: 1956-05-24
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Granted: 1958-08-19
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Expires: 1976-05-24
Abstract
No abstract record available.
Inventors
- 👤 Richard L Woodruff
- 👤 Robert M Ellsworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:01
CPC Classifications
C; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
AN ASPHALT COMPOSITION COMPRISING A MAJOR AMOUNT OF AN ASPHALT, A CONTAMINATING MINOR AMOUNT OF A HYDROCARBON WAX, SAID WAX BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 1% AND ABOUT 10% BY WEIGHT OF THE COMBINED ASPHALT AND WAX, AND BETWEEN ABOUT 0.01% AND ABOUT 0.5% BY WEIGHT EACH OF A HYDROCARBON RUBBER OF THE GROUP CONSISTING OF NATURAL RUBBER, BUTADIENE-STYRENE RUBBERS, AND ISOBUTYLENE COPOLYMERIZED WITH 1.15-4.5% BY WEIGHT OF A DI-OLEFIN AND A POLYMERIZED ESTER OF AN ACRYLIC ACID AND AN ALIPHATIC MONOHYDRIC ALCOHOL HAVING BETWEEN 8 AND 24 CARBON ATOMS PER MOLECULE, SAID POLYMERIZED ESTER HAVING A MOLECULAR WEIGHT BETWEEN 5,000 AND 500,000.
Claim 2
Dependent Claim
105 words
AN ASPHALT COMPOSITION COMPRISING A MAJOR AMOUNT OF AN ASPHALT, A CONTAMINATING MINOR AMOUNT OF A HYDROCARBON WAX, SAID WAX BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 1% AND ABOUT 10% BY WEIGHT OF THE COMBINED ASPHALT AND WAX, AND BETWEEN ABOUT 0.01% AND ABOUT 0.5% BY WEIGHT EACH OF A HYDROCARBON RUBBER OF THE GROUP CONSISTING OF NATURAL RUBBER, BUTADIENE-STYRENE RUBBERS, AND ISOBUTYLENE COPOLYMERIZED WITH 1.15-4.5% BY WEIGHT OF A DI-OLEFIN AND A POLYMERIZED ESTER OF AN ACRYLIC ACID AND AN ALIPHATIC MONOHYDRIC ALCOHOL HAVING BETWEEN 8 AND 24 CARBON ATOMS PER MOLECULE, SAID POLYMERIZED ESTER HAVING A MOLECULAR WEIGHT BETWEEN 5,000 AND 500,000.
References Cited (Backward Citations)
US2235536A
Cited
US2534883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |