Patent US2430086A successfully refreshed from Google Patents.
US2430086A
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Extractants and process for concentrating organic acids
Assignee: Carbide and Carbon Chemicals Corp
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Filing: 1942-07-02
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Granted: 1947-11-04
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Expires: 1962-07-02
Abstract
No abstract record available.
Inventors
- 👤 Charles E Staff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:59
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2197467A
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US1915002A
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US2164007A
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US2199983A
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US2275862A
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US2273785A
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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) | 1950-11-03 | 1951-05-05 | 1951-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-11-03 | 1955-05-05 | 1955-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-11-03 | 1959-05-05 | 1959-11-04 | $7700.00 | Window Closed / Lapsed |