US3646033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derivatives of isoindoline
Assignee: Bayer AG
•
Filing: 1967-09-08
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Granted: 1972-02-29
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Expires: 1987-09-08
Abstract
Abstract ISOINDOLINE DERIVATIVES ASYMMETRICALLY DISUBSTITUTED IN THE 1- AND 3-POSITION CORRESPONDING TO THE GENERAL FORMULA 1-R1,3-R2-ISOINDOLINE IN WHICH THE CYCLIC RADICAL R IS AN AROMATIC RING, A SUBSTITUTED AROMATIC RING, A TETRAHYDROGENATED AROMATIC RING, A NITROGEN-CONTAINING HETEROCYCLIC RING, OR A SULPHUR-CONTAINING HETERCOYCLIC RING AND R1 AND R2 WHICH ARE DIFFERENT ARE BIVALENT RADICALS OF A COMPOUND WHICH CONTAINS TWO ACTIVE HYDROGEN ATOMS ATTACHED TO A CARBON OR NITOGEN ATOM AND A TWO-STAGE PROCESS FOR MAKING THE SAME. THE ISOINDOLINE DERIVATIVES ARE EXCELLENT DYESTUFFS FOR DYEING AND PRINTING SYNTHETIC FIBER MATERIALS.
Inventors
- 👤 Heinrich Leister
- 👤 Heinrich Vollmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:17
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/04; C07; C07D; C07D209/00; C07D209/02; C07D209/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |