US2467855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of decomposing acid sludge
Assignee: Standard Oil Development Co
•
Filing: 1947-01-27
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Granted: 1949-04-19
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Expires: 1967-01-27
Abstract
No abstract record available.
Inventors
- 👤 Chester L Read
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:19
CPC Classifications
C; C10; C10B; C10B49/00; C10B49/16; C10B49/20; C10B49/22; B; B01; B01J; B01J8/00; B01J8/18; C01; C01B; C01B17/00; C01B17/48; C01B17/50; C01B17/58; C10B53/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-04-18 | 1952-10-18 | 1953-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-04-18 | 1956-10-18 | 1957-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-04-18 | 1960-10-18 | 1961-04-19 | $7700.00 | Window Closed / Lapsed |