US3433831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation and purification of acrylic acid from acetic acid by solvent extraction and azeotropic distillation with a two component solvent-entrainer system
Assignee: Asahi Kasei Corp
•
Filing: 1966-06-29
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Granted: 1969-03-18
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Expires: 1986-06-29
Abstract
No abstract record available.
Inventors
- 👤 Akira Yomiyama
- 👤 Tsuneyuki Kato
- 👤 Atsushi Aoshima
- 👤 Tokuichiro Kawanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:27
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; C07C51/46; Y; Y10; Y10S; Y10S203/00; Y10S203/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1668380A
Cited
US1860553A
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US1915002A
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US2854385A
Cited
US3337740A
Cited
US3344178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |