US2762755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt and method of preparation thereof
Assignee: ExxonMobil Oil Corp
•
Filing: 1952-03-20
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Granted: 1956-09-11
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Expires: 1972-03-20
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert N Kinnaird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:53
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE PROCESS FOR PREPARING AN ASPHALT WHICH COMPRISES: (1) TREATING AN ASPHALT CHARGE STOCK WITH A RELATIVELY SMALL AMOUNT, FROM ABOUT 1/10 TO ABOUT 10 PER CENT BY WEIGHT OF THE ASPHALT CHARGE STOCK, OF PHOSPHORIC ACID, AT A TEMPERATURE FROM ABOUT 200* F. TO ABOUT 350* F. FOR A PERIOD OF TIME FROM 4 HOURS TO ABOUT 1/2 HOUR; AND (2) OXIDIZING THE PRODUCT OBTAINED IN (1), AT A TEMPERATURE FROM ABOUT 350* F. TO ABOUT 450* F. UNTIL THE DESIRED SOFTENING POINT IS OBTAINED.
Claim 2
Dependent Claim
86 words
THE PROCESS FOR PREPARING AN ASPHALT WHICH COMPRISES: (1) TREATING AN ASPHALT CHARGE STOCK WITH A RELATIVELY SMALL AMOUNT, FROM ABOUT 1/10 TO ABOUT 10 PER CENT BY WEIGHT OF THE ASPHALT CHARGE STOCK, OF PHOSPHORIC ACID, AT A TEMPERATURE FROM ABOUT 200* F. TO ABOUT 350* F. FOR A PERIOD OF TIME FROM 4 HOURS TO ABOUT 1/2 HOUR; AND (2) OXIDIZING THE PRODUCT OBTAINED IN (1), AT A TEMPERATURE FROM ABOUT 350* F. TO ABOUT 450* F. UNTIL THE DESIRED SOFTENING POINT IS OBTAINED.
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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) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |