US2912437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of aromatic homocyclic or heterocyclic di-and polycarboxylic acids
Assignee: Henkel AG and Co KGaA
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Filing: 1957-09-17
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Granted: 1959-11-10
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Expires: 1977-09-17
Abstract
No abstract record available.
Inventors
- 👤 Schutt Hartwig
- 👤 Stein Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:37
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/803; C07C; C07C51/00; C07C51/15; C07D307/00; C07D307/02; C07D307/34; C07D307/56; C07D307/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR THE PRODUCTION OF COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF AROMATIC POLYCARBOXYLIC ACIDS AND SALTS AND ESTERS THEREOF BE SELECTIVE REARRANGEMENT WHICH COMPRISES REACTING AN AROMATIC COMPOUND CONTAINING NITROGEN-CONTAINING SUBSTITUENTS ATTACHED DIRECTLY TO RING SELECTED FROM THE GROUP CONSISTING OF NITRILE, AMIDE AND IMIDE GROUPS WITH AN ACID-BINDING AGENT AND A SOURCE OF CARBON DIOXIDE SELECTED FROM THE GROUP CONSISTING OF FREE CARBON DIOXIDE AND BOUND CARBON DIOXIDE AT TEMPERATURES ABOVE ABOUT 250* C,. UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS, AND RECOVERING COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF AROMATIC POLYCARBOXYLIC ACIDS AND SALTS AND ESTERS THEREOF.
Claim 2
Dependent Claim
98 words
A PROCESS FOR THE PRODUCTION OF COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF AROMATIC POLYCARBOXYLIC ACIDS AND SALTS AND ESTERS THEREOF BE SELECTIVE REARRANGEMENT WHICH COMPRISES REACTING AN AROMATIC COMPOUND CONTAINING NITROGEN-CONTAINING SUBSTITUENTS ATTACHED DIRECTLY TO RING SELECTED FROM THE GROUP CONSISTING OF NITRILE, AMIDE AND IMIDE GROUPS WITH AN ACID-BINDING AGENT AND A SOURCE OF CARBON DIOXIDE SELECTED FROM THE GROUP CONSISTING OF FREE CARBON DIOXIDE AND BOUND CARBON DIOXIDE AT TEMPERATURES ABOVE ABOUT 250* C,. UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS, AND RECOVERING COMPOUNDS SELECTED FROM THE GROUP CONSISTING OF AROMATIC POLYCARBOXYLIC ACIDS AND SALTS AND ESTERS THEREOF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-09 | 1963-05-11 | 1963-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-09 | 1967-05-11 | 1967-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-09 | 1971-05-11 | 1971-11-10 | $7700.00 | Window Closed / Lapsed |