US3767587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable aqueous dispersions of optical brightening agents
Assignee: Bayer AG
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Filing: 1971-04-01
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Granted: 1973-10-23
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Expires: 1991-04-01
Abstract
Abstract PROCESS FOR THE PRODUCTION OF STABLE AQUEOUS DISPERSIONS OF SPARINGLY WATER-SOLUBLE OPTICAL BRIGHTENING AGENTS, CHARACTERISED IN THAT ASSOCIATION COMPLEXES OF THESE BRIGHTENING AGENTS AND LOW-MOLECULAR COMPLEX FORMERS ARE INTRODUCED INTO AQUEOUS SOLUTIONS OF POLYMERIC COMPOUNDS, WHICH MAY CONTAIN SURFACE-ACTIVE AGENTS, WHEREIN SUCH OPTICAL BRIGHTNERS ARE PREFERABLY USED, WHOSE ASSOCIATION COMPLEXES WITH 1,3-DINITROBENZENE EXHIBIT IN A DIOXAN SOLUTION CONTAINING THE BRIGHTENING AGENT IN A 10-3MOLAR AND 1,3-DINITROBENZENE IN A 2.7-MLAR CONCENTRATION AT 20*C. AND A LAYER THICKNESS OF 1CM. A $$M-VALUE OF BETWEEN 5.10-3 AND 600.10-3.
Inventors
- 👤 U Claussen
- 👤 G Boehmke
- 👤 Bonin W Von
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:56
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/40; C11D3/42; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; D; D06; D06L; D06L4/00; D06L4/60; D06L4/614; D06L4/636; 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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |