Patent US3689429A successfully refreshed from Google Patents.
US3689429A
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Dispersions of optical brighteners containing salt-forming solubilizing groups
Assignee: Hoechst AG
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Filing: 1971-04-15
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Granted: 1972-09-05
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Expires: 1991-04-15
Abstract
Abstract STABLE DISPERSIONS OF OPTICAL BRIGHTENERS HAVING SALTFORMING SOLUBILIZING GROUPS ARE OBTAINED WHEN USING AN ANHYDROUS WATER-MISCIBLE DI- OR TRIHYDRIC LOWER ALIPHATIC ALCOHOL, A LOWER ALKYL OR PHENYL ETHER OR A WATER-SOLUBLE POLYETHER THEREOF AS DISPERSING AGENT AND DISPERSING MEDIIUM. THE USE OF A FURTHER NON-IONIC DISPERSING AGENT IS OPTIONAL. THESE DISPERSIONS ARE PREFERRED FOR CONTINUOUS BRIGHTENING PROCESSES BECAUSE OF THEIR EASY DOSAGE AND THE AVOIDING OF DUST AND ISSOLVING MANIPULATIONS.
Inventors
- 👤 Reinhold Deubel
- 👤 Erich Schinzel
- 👤 Volker Hemmerling
- 👤 Gunter Rosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:52
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0075; C09B67/0072; D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/621; D06L4/664
Claims Analysis
Total Claims: 0
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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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |