US3752688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for wet grinding of pigments in aqueous alkaline medium
Assignee: Hoechst AG
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Filing: 1971-09-02
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Granted: 1973-08-14
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Expires: 1991-09-02
Abstract
Abstract A PROCESS FOR THE WET GRINDING OF PIGMENTS WHICH COMPRISES EFFECTING THE GRINDING IN AN AQUEOUS MEDIUM CONTAINING 0.1-20 PERCENT OF A BASE SELECTED FROM THE GROUP OF WATER SOLUBLE ALKALI METAL-, ALKALI EARTH METAL- OR AMMONIUM COMPOUNDS. THE ADDITION OF BASES INPROVES THE TRANSMISSION OF GRINDING ENERGY TO THE MATERIAL BEING GROUND AND RESULTS IN THE PRODUCTION OF PURER PIGMENTS OF BETTER TINCTORIAL STRENGTH IN A RELATIVELY SHORT GRINDING TIMEFURTHERMORE, THE GRINDING PROCESS ACCORDING TO THE INVENTION IS CARRIED OUT IN A SIMPLE AND INEXPENSIVE WAY.
Inventors
- 👤 J Weide
- 👤 O Fuchs
- 👤 R Deubel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:34
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/04; C09C3/041; C09B; C09B67/00; C09B67/0001; C09B67/0022
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 |