US1684489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Counterflow treatment of petroleum oils
Assignee: Standard Oil Company of California
•
Filing: 1923-12-10
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Granted: 1928-09-18
•
Expires: 1943-12-10
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Halloran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:47
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0426; B01D11/043
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) | 1931-09-18 | 1932-03-19 | 1932-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-09-18 | 1936-03-19 | 1936-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-09-18 | 1940-03-19 | 1940-09-18 | $7700.00 | Window Closed / Lapsed |