US2492994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bituminous compositions
Assignee: Shell Development Co
•
Filing: 1948-05-11
•
Granted: 1950-01-03
•
Expires: 1968-05-11
Abstract
No abstract record available.
Inventors
- 👤 Harman Denham
- 👤 Harry J Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:21
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
22 words
AN ASPHALT COMPOSITION CONSISTING ESSENTIALLY OF A MAJOR AMOUNT OF AN ASPHALT AND 0.1-5.0% BY WEIGHT OF AN ACID HAVING THE STRUCTURE:
References Cited (Backward Citations)
US2191295A
Cited
US2370386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |