US2418210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating alkylation sulfuric acid sludge
Assignee: Stauffer Chemical Co
•
Filing: 1944-05-01
•
Granted: 1947-04-01
•
Expires: 1964-05-01
Abstract
No abstract record available.
Inventors
- 👤 Cecil B Wilde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:56
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/90; C01B17/92
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-03-31 | 1950-09-30 | 1951-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-31 | 1954-09-30 | 1955-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-31 | 1958-09-30 | 1959-04-01 | $7700.00 | Window Closed / Lapsed |