US2327247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing asphalt
Assignee: Union Oil Company of California
•
Filing: 1939-06-16
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Granted: 1943-08-17
•
Expires: 1959-06-16
Abstract
No abstract record available.
Inventors
- 👤 Donald E Carr
- 👤 Harold W Ritchey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:35
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1946-08-16 | 1947-02-15 | 1947-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1950-08-16 | 1951-02-15 | 1951-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1954-08-16 | 1955-02-15 | 1955-08-17 | $7700.00 | Window Closed / Lapsed |