US3340264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing n, n'-diarylperylenetetracarboxylic diimides
Assignee: EIDP Inc
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Filing: 1964-05-06
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Granted: 1967-09-05
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Expires: 1984-05-06
Abstract
No abstract record available.
Inventors
- 👤 Richard L Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:30
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A PROCESS FOR THE PREPARATION OF N,N''-DIARYLPERYLENETETRACARBOXYLIC DIIMIDES WHICH PROCESS COMPRISES HEATING IN AN AQUEOUS MEDIUM A MIXTURE CONSISTING ESSENTIALLY OF ONE MOLE OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF 3,4,9,10-PERYLLENETETRACARBOXYLIC ACID AND THE ANHYDRIDE THEREOF AND AT LEAST TWO MOLES OF A PRIMARY ARYLAMINE IN THE PRESENCE OF A TERTIARY NITROGEN BASE SELECTED FROM THE GROUP CONSISTING OF PYRIDINE, ALKYLPYRIDINE, QUINOLINE, ISOQUINOLINE, AND N,N-DIALKYLANILINES, SAID MISTURE BEING HEATED UNDER AMBIENT PRESSURE TO A TEMPERATURE OF FROM ABOUT 85*C. TO THE REFLUXING TEMPERATURE OF SAID MIXTURE, AND RECOVERING FROM SAID AQUEOUS MEDIUM N,N''-DIARYLPERYLENETETRACARBOXYLIC DIIMIDE.
Claim 2
Dependent Claim
96 words
A PROCESS FOR THE PREPARATION OF N,N''-DIARYLPERYLENETETRACARBOXYLIC DIIMIDES WHICH PROCESS COMPRISES HEATING IN AN AQUEOUS MEDIUM A MIXTURE CONSISTING ESSENTIALLY OF ONE MOLE OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF 3,4,9,10-PERYLLENETETRACARBOXYLIC ACID AND THE ANHYDRIDE THEREOF AND AT LEAST TWO MOLES OF A PRIMARY ARYLAMINE IN THE PRESENCE OF A TERTIARY NITROGEN BASE SELECTED FROM THE GROUP CONSISTING OF PYRIDINE, ALKYLPYRIDINE, QUINOLINE, ISOQUINOLINE, AND N,N-DIALKYLANILINES, SAID MISTURE BEING HEATED UNDER AMBIENT PRESSURE TO A TEMPERATURE OF FROM ABOUT 85*C. TO THE REFLUXING TEMPERATURE OF SAID MIXTURE, AND RECOVERING FROM SAID AQUEOUS MEDIUM N,N''-DIARYLPERYLENETETRACARBOXYLIC DIIMIDE.
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) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |