US2834811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acetylacetone
Assignee: Shawinigan Chemicals Ltd
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Filing: 1956-11-27
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Granted: 1958-05-13
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Expires: 1976-11-27
Abstract
No abstract record available.
Inventors
- 👤 Karl K Georgieff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:54
CPC Classifications
C; C07; C07C; C07C49/00; C07C49/04; C07C49/12; C07C49/14; C07C45/00; C07C45/45; C07C45/455; C07C45/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR THE PREPARATION OF ACETYLACETONE FROM A REACTION MIXTURE CONTAINING THE SODIUM SALT OF ACETYLACETONE COMPRISING (A) ACIDIFYING THE REACTION MIXTURE WITH ORGANIC ACID TO DECREASING PH VALUES IN SUCCESSIVE STAGES TO LIBERATE ONLY A PART OF THE ACETYLACETONE FROM ITS SALT IN EACH STAGE PRIOR TO THE LAST STAGE AND (B) RECOVERING THE LIBERATED ACETYLACETONE FROM THE ACIDIFIED REACTION MIXTURE AFTER EACH OF THE SUCCESSIVE ACIDIFICATION STAGES.
Claim 2
Dependent Claim
70 words
A PROCESS FOR THE PREPARATION OF ACETYLACETONE FROM A REACTION MIXTURE CONTAINING THE SODIUM SALT OF ACETYLACETONE COMPRISING (A) ACIDIFYING THE REACTION MIXTURE WITH ORGANIC ACID TO DECREASING PH VALUES IN SUCCESSIVE STAGES TO LIBERATE ONLY A PART OF THE ACETYLACETONE FROM ITS SALT IN EACH STAGE PRIOR TO THE LAST STAGE AND (B) RECOVERING THE LIBERATED ACETYLACETONE FROM THE ACIDIFIED REACTION MIXTURE AFTER EACH OF THE SUCCESSIVE ACIDIFICATION STAGES.
References Cited (Backward Citations)
US2158071A
Cited
FR995499A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |