US2696489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydration of maleic acid
Assignee: Monsanto Chemicals Ltd
•
Filing: 1953-06-16
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Granted: 1954-12-07
•
Expires: 1973-06-16
Abstract
No abstract record available.
Inventors
- 👤 James F Adams
- 👤 Ferdinand B Zienty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:51
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; C07C51/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR CONVERTING MALEIC ACID TO MALEIC ANHYDRIDE WHICH COMPRISES FEEDING AN AQUEOUS MALEIC ACID COMPOSITION INTO A BOILING POOL OF MELEIC ANHYDRIDE MAINTAINED UNDER REFLUX CONDITIONS AND REMOVING THE WATER VAPOR FROM THE VAPORS EVOLVED FROM SAID POOL, WHEREIN THE RATE OF FEED OF SAID AQUEOUS COMPOSITION IS NOT GREATER THAN 3 PARTS OF MALEIC ACID PER PART OF WATER REMOVED.
Claim 2
Dependent Claim
63 words
A PROCESS FOR CONVERTING MALEIC ACID TO MALEIC ANHYDRIDE WHICH COMPRISES FEEDING AN AQUEOUS MALEIC ACID COMPOSITION INTO A BOILING POOL OF MELEIC ANHYDRIDE MAINTAINED UNDER REFLUX CONDITIONS AND REMOVING THE WATER VAPOR FROM THE VAPORS EVOLVED FROM SAID POOL, WHEREIN THE RATE OF FEED OF SAID AQUEOUS COMPOSITION IS NOT GREATER THAN 3 PARTS OF MALEIC ACID PER PART OF WATER REMOVED.
References Cited (Backward Citations)
US2205402A
Cited
US2340490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-06 | 1958-06-07 | 1958-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-06 | 1962-06-07 | 1962-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-06 | 1966-06-07 | 1966-12-07 | $7700.00 | Window Closed / Lapsed |