US3582381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for converting aryl pararosaniline sulfonic acid dyestuffs into pigments
Assignee: Hoechst AG
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Filing: 1968-08-02
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Granted: 1971-06-01
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Expires: 1988-08-02
Abstract
Abstract A PROCESS FOR CONVERTING ARYL-PARAROSANILINE SULFONIC ACID DYESTUFFS INTO PIGMENTS HAVING HIGH TINCTORIAL STRENGTH AND SOFT GRAIN AND BEING EASILY DISPERSIBLE, IN WHICH PROCESS AQUEOUS SUSPENSIONS OF SAID DYESTUFFS ARE TREATED WITH AQUEOUS EMULSIONS OF VEHICLES AT ELEVATED TEMPERATURE AND THE PIGMENTS ARE RECOVERED.
Inventors
- 👤 Theodor Papenfuss
- 👤 Heinz Rentel
- 👤 Ernst Spietschka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:20
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/12; C09B67/00; C09B67/006; C09B67/0061
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |