US3794659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asymmetrically disubstituted isoindolines
Assignee: Bayer AG
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Filing: 1971-09-08
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Granted: 1974-02-26
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Expires: 1991-09-08
Abstract
Abstract ISOINDOLINE DERIVATIVES ASYMMETRICALLY DISUBSTITUTED IN THE 1- AND 3-POSITIONS CORRESPONDING TO THE FORMULA 1-(R''=),3-(R2=)ISOINDOLINE IN WHICH THE CYCLIC RADICAL R IS ANAROMATIC RING, A SUBSTITUTED AROMATIC RING, A TETRAHYDROGENATED AROMATIC RING, A NITROGEN CONTAINING HETEROCYCLIC RING,OR A SULPHUR CONTAINING HETEROCYCLIC RING, AND R1 AND R2 WHICH ARE DIFFERENT, ARE BIVALENT RADICALS OF A COMPOUND WHICH CONTAINS TWO ACTIVE HYDROGEN ATOMS ATACHED TO A NITROGEN ATOM; AND A TWO-STAGE PROCESS FOR MAKING THE SAME. THE ISOINDOLINE DERIVATIVES ARE EXCELLENT DYESTUFFS FOR DYEING AND PRINTING SYNTHETIC FIBER MATERIALS.
Inventors
- 👤 H Leister
- 👤 H Vollmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:54
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/04; C07; C07D; C07D209/00; C07D209/02; C07D209/44
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |