US2901369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming foamed asphalt
Assignee: Shell Development Co
•
Filing: 1957-08-08
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Granted: 1959-08-25
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Expires: 1977-08-08
Abstract
No abstract record available.
Inventors
- 👤 Pordes Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:02
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C10; C10C; C10C3/00; C10C3/14; C08J2395/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR THE MANUFACTURE OF FOAMED ASPHALT WHICH COMPRISES HEATING ASPHALT IN WHICH IS DISPERSED A GAS GENERATING AGENT AND AN OIL-SOLUBLE SURFACE-ACTIVE AGENT CONTAINING AT LEAST 1 HYDROCARBON RADICAL HAVING AT LEAST 8 CARBON ATOMS AND AT LEAST 1 POLAR GROUP, TO A TEMPERATURE OF 100-200*C., SAID TEMPERATURE BEING ABOVE BOTH THE SOFTENING POINT OF THE ASPHALT AND THE DECOMPOSITION TEMPERATURE OF THE GAS GENERATING AGENT BUT BELOW THE TEMPERATURE AT WHICH THE VISCOSITY OF THE ASPHALT FALLS TO SUCH A LOW VALUE THAT A SUBSTANTIAL ESCAPE OF EMITTED GAS OCCURS, MAINTAINING THE MIXTURE AT THE SAID TEMPERATURE UNTIL THE DESIRED FOAM VOLUME HAS BEEN OBTAINED AND COOLING THE FOAMED ASPHALT.
Claim 2
Dependent Claim
113 words
A PROCESS FOR THE MANUFACTURE OF FOAMED ASPHALT WHICH COMPRISES HEATING ASPHALT IN WHICH IS DISPERSED A GAS GENERATING AGENT AND AN OIL-SOLUBLE SURFACE-ACTIVE AGENT CONTAINING AT LEAST 1 HYDROCARBON RADICAL HAVING AT LEAST 8 CARBON ATOMS AND AT LEAST 1 POLAR GROUP, TO A TEMPERATURE OF 100-200*C., SAID TEMPERATURE BEING ABOVE BOTH THE SOFTENING POINT OF THE ASPHALT AND THE DECOMPOSITION TEMPERATURE OF THE GAS GENERATING AGENT BUT BELOW THE TEMPERATURE AT WHICH THE VISCOSITY OF THE ASPHALT FALLS TO SUCH A LOW VALUE THAT A SUBSTANTIAL ESCAPE OF EMITTED GAS OCCURS, MAINTAINING THE MIXTURE AT THE SAID TEMPERATURE UNTIL THE DESIRED FOAM VOLUME HAS BEEN OBTAINED AND COOLING THE FOAMED ASPHALT.
References Cited (Backward Citations)
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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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |