US3752686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the conversion of perylene-3,4,9,10 - tetracarboxylic acid diimide into a form suitable as pigment dyestuff
Assignee: Bayer AG
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Filing: 1971-12-23
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Granted: 1973-08-14
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Expires: 1991-12-23
Abstract
Abstract PERYLENE - 3,4,9,10-TETRACARBOXYLIC ACID DIIMIDE IS OBTAINED IN A BRILLIANT, DEEPLY COLOURED, LIGHT- AND WEATHERFAST PIGMENT FROM BY SALT GRINDING IN THE PRESENCE OF 130% OF HIGHER ALIPHATIC AMINES.
Inventors
- 👤 D Kalz
- 👤 K Wolf
- 👤 G Wolfrum
- 👤 R Hornle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:16
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0001; C09B67/002; C09B5/00; C09B5/62
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |