US2663672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of asphalt
Assignee: Standard Oil Development Co
•
Filing: 1952-04-01
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Granted: 1953-12-22
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Expires: 1972-04-01
Abstract
No abstract record available.
Inventors
- 👤 Charles A Kraus
- 👤 David W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:11
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/02; C10C3/023; C08; C08K; C08K3/00; C08K3/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
THE METHOD OF UPGRADING AN ASPHALT MATERIAL WHICH COMPRISES REACTING THE SAID ASPHALTIC MATERIAL WITH A HALIDE DERIVATIVE OF SIH4 AT A TEMPERATURE OF ABOUT 200 TO 600* F. FOR A PERIOD LONGER THAN ABOUT ONE-HALF HOUR.
References Cited (Backward Citations)
US2585119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |