US2989494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for incorporating rubber latex in asphalt
Assignee: Phillips Petroleum Co
•
Filing: 1957-08-14
•
Granted: 1961-06-20
•
Expires: 1977-08-14
Abstract
No abstract record available.
Inventors
- 👤 Armin C Pitchford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:39
CPC Classifications
C; C08; C08L; C08L95/00; Y; Y10; Y10S; Y10S528/00; Y10S528/931; Y10S528/934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
IN A PROCESS FOR PREPARING ASPHALT-RUBBER BLENDS, THE IMPROVEMENT COMPRISING THE STEPS OF FORMING A HEATED MIXTURE OF ASPHALT AND RUBBER LATEX AT A TEMPERATURE ABOVE THE NORMAL BOILING POINT OF WATER AND UNDER SUFFICIENT PRESSURE TO MAINTAIN WATER IN THE LIQUID PHASE, AND THEREAFTER REDUCING THE PRESSURE OF SAID MIXTURE SUFFICIENTLY TO CAUSE FLASH VAPORIZATION OF THE WATER FROM SAID MIXTURE.
Claim 2
Dependent Claim
62 words
IN A PROCESS FOR PREPARING ASPHALT-RUBBER BLENDS, THE IMPROVEMENT COMPRISING THE STEPS OF FORMING A HEATED MIXTURE OF ASPHALT AND RUBBER LATEX AT A TEMPERATURE ABOVE THE NORMAL BOILING POINT OF WATER AND UNDER SUFFICIENT PRESSURE TO MAINTAIN WATER IN THE LIQUID PHASE, AND THEREAFTER REDUCING THE PRESSURE OF SAID MIXTURE SUFFICIENTLY TO CAUSE FLASH VAPORIZATION OF THE WATER FROM SAID MIXTURE.
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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |