Patent US2520720A successfully refreshed from Google Patents.
US2520720A
Expired / Lapsed
US
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Bituminous compositions
Assignee: Shell Development Co
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Filing: 1947-09-30
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Granted: 1950-08-29
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Expires: 1967-09-30
Abstract
No abstract record available.
Inventors
- 👤 Harman Denham
- 👤 Harry J Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:10
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
A BITUMINOUS COMPOSITION HAVING IMPROVED ADHESION AND COMPRESSION CHARACTERISTICS COMPRISING A MAJOR AMOUNT OF AN ASPHALT AND 0.5-5% BY WEIGHT OF A WATER-INSOLUBLE MATERIAL OBTAINED BY REACTING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND AN ALIPHATIC PRIMARY AMINE HAVING 1-24 CARBON ATOMS WITH AN ALPHAMETHYLENE ALKANAL AT A TEMPERATURE BETWEEN -70*C. AND +150*C., HYDROGENATING THE RESULTING REACTION PRODUCT AND REACTING THE HYDROGENATED REACTION PRODUCT WITH AN ORGANIC CARBOXYLIC ACID HAVING MORE THAN 6 CARBON ATOMS TO PRODUCE SAID WATER-INSOLUBLE MATERIAL.
Claim 2
Dependent Claim
83 words
A BITUMINOUS COMPOSITION HAVING IMPROVED ADHESION AND COMPRESSION CHARACTERISTICS COMPRISING A MAJOR AMOUNT OF AN ASPHALT AND 0.5-5% BY WEIGHT OF A WATER-INSOLUBLE MATERIAL OBTAINED BY REACTING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF AMMONIA AND AN ALIPHATIC PRIMARY AMINE HAVING 1-24 CARBON ATOMS WITH AN ALPHAMETHYLENE ALKANAL AT A TEMPERATURE BETWEEN -70*C. AND +150*C., HYDROGENATING THE RESULTING REACTION PRODUCT AND REACTING THE HYDROGENATED REACTION PRODUCT WITH AN ORGANIC CARBOXYLIC ACID HAVING MORE THAN 6 CARBON ATOMS TO PRODUCE SAID WATER-INSOLUBLE MATERIAL.
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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |