US2090941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of ammonia and amines from their salts with organic acids
Assignee: Celanese Corp
•
Filing: 1935-03-22
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Granted: 1937-08-24
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Expires: 1955-03-22
Abstract
No abstract record available.
Inventors
- 👤 Dreyfus Henry
- 👤 Oxley Horace Finningley
- 👤 Thomas Edward Boaden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:04
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02
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) | 1940-08-23 | 1941-02-22 | 1941-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-23 | 1945-02-22 | 1945-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-23 | 1949-02-22 | 1949-08-24 | $7700.00 | Window Closed / Lapsed |