US3758497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
The isoindoline series process for the production of deeply coloured transparent pigments of
Assignee: Novartis AG
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Filing: 1971-07-12
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Granted: 1973-09-11
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Expires: 1991-07-12
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF DEEPLY COLOURED, TRANSPARENT ISOINDOLINE PIGMENTS IS DESCRIBED WHICH COMPRISES PRODUCTION OF A SALT OF THE PIGMENT BY REACTION WITH A BASE, AND SUBSEQUENT CONVERSION OF THE SALT TO TO THE PIGMENT IN ITS FREE, ACIDIC FORM. PROCESS OF COLOURING PRINTING INKS, LACQUERS AND SYNTHETIC PLASTICS MATERIALS WITH THE AID OF THE THUS TREATED PIGMENTS OF INCREASED COLOR-DEPTH AND TRANSPARENCY ARE ALSO DISCLOSED.
Inventors
- 👤 A Pugin
- 👤 Der Crone J Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:41
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/04; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/50; C09B67/00; C09B67/0096; C09B69/00; C09B69/02
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |