US3910951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of succinimide
Assignee: BASF SE
•
Filing: 1974-03-11
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Granted: 1975-10-07
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Expires: 1994-03-11
Abstract
Abstract Manufacture of succinimide from succinic acid and aqueous ammonia in the presence of small amounts of tertiary ammonium phosphate.
Inventors
- 👤 Ernst Fuerst
- 👤 Siegfried Winderl
- 👤 Arnold Wittwer
- 👤 Herwig Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:09
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/30; C07D207/34; C07D207/36; C07D207/40; C07D207/404
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
44 words
IN A PROCESS FOR THE MANUFACTUR OF SUCCINIMIDE BY REACTING SUCCINIC ACID WITH AQUEOUS AMMONIA SOLUTION AT A TEMPERATUR OF ABOUT 250* TO 260*C, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION IN THE PRESENCE OF AN EFFECTIVE MINOR QUANTITY OF TERTIRAY AMMONIMUM PHOSPHATE.
Claim 2
Dependent Claim
44 words
IN A PROCESS FOR THE MANUFACTUR OF SUCCINIMIDE BY REACTING SUCCINIC ACID WITH AQUEOUS AMMONIA SOLUTION AT A TEMPERATUR OF ABOUT 250* TO 260*C, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION IN THE PRESENCE OF AN EFFECTIVE MINOR QUANTITY OF TERTIRAY AMMONIMUM PHOSPHATE.
Claim 3
Dependent Claim
33 words
A process as set forth in claim 1, wherein the reaction is carried out in the presence of from about 0.5 to 1.5% by weight of tertiary ammonium phosphate based on succinic acid.
Claim 4
Dependent Claim
23 words
A process as set forth in claim 1, wherein the reaction is carried out at a temperature of from approximately 250* to 255*C.
References Cited (Backward Citations)
US3431276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |