Patent US2697667A successfully refreshed from Google Patents.
US2697667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt compositions
Assignee: Shell Development Co
•
Filing: 1951-06-19
•
Granted: 1954-12-21
•
Expires: 1971-06-19
Abstract
No abstract record available.
Inventors
- 👤 Hoogstraaten Jacques Pi Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:23
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/09; C08K5/098
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
AN ASPHALT COMPOSITION HAVING REDUCED SWEATING TENDENCY CONSISTING ESSENTIALLY OF A MAJOR AMOUNT OF AN OXIDIZED ASPHALT HAVING A PENETRATION INDEX GREATER THAN ABOUT +4 AND FROM ABOUT 10% TO ABOUT 20% BASED ON THE WEIGHT OF THE ASPHALT OF AN ALKALINE EARTH METAL SOAP OF NAPHTHENIC ACIDS, SAID NAPHTHENIC ACIDS HAVING AN AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 250 AND ABOUT 600 THE PRESENCE OF SAID NAPHTHENATE HAVING SUBSTANTIALLY NO EFFECT UPON THE PENETRATION AND SOFTENING POINT OF SAID COMPOSITION.
Claim 2
Dependent Claim
80 words
AN ASPHALT COMPOSITION HAVING REDUCED SWEATING TENDENCY CONSISTING ESSENTIALLY OF A MAJOR AMOUNT OF AN OXIDIZED ASPHALT HAVING A PENETRATION INDEX GREATER THAN ABOUT +4 AND FROM ABOUT 10% TO ABOUT 20% BASED ON THE WEIGHT OF THE ASPHALT OF AN ALKALINE EARTH METAL SOAP OF NAPHTHENIC ACIDS, SAID NAPHTHENIC ACIDS HAVING AN AVERAGE MOLECULAR WEIGHT BETWEEN ABOUT 250 AND ABOUT 600 THE PRESENCE OF SAID NAPHTHENATE HAVING SUBSTANTIALLY NO EFFECT UPON THE PENETRATION AND SOFTENING POINT OF SAID COMPOSITION.
References Cited (Backward Citations)
GB355430A
Cited
US2286414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |