Brightener compositions
Abstract
Abstract HYDROPHILIC COLLOIDS HAVING INTIMATELY DISPERSED THEREIN AN ESSENTIALLY HYDROPHOBIC SOLID SOLUTION OF AN OIL-SOLUBLE BRIGHTENING AGENT IN AN ESSENTIALLY HYDROPHOBIC ORGANIC SOLVENT THAT IS RIGID (AN ORGANIC GLASS) AT ROOM TEMPERATURE, I.E., HAS A GLASS TRANSITION TEMPERATURE (TG) THAT IS ABOVE ABOUT 25*C. AND IS A POLYMER THAT IS AN ACETAL CONDENSATION PRODUCT OF POLYVINYL ALCOHOL AND AN ALDEHYDE OR KETONE HAVING FROM 2 TO 40 CARBON ATOMS ARE ADVANTAGEOUSLY USED IN PHOTOGRAPHIC ELEMENTS AND IN IMAGE RECEIVING ELEMENTS FOR IMAGE DIFFUSION TRANSFER BECAUSE THE LIGHT-STABILITY OF THE BRIGHTENING AGENTS IN THESE DISPERSIONS IS INCREASED SUBSTANTIALLY OVER THE LIGHTSTABILITY OF THE SAME BRIGHTENING AGENTS IN DISPERSIONS OUTSIDE THE IMMEDIATE INVENTION.
Inventors
- 👤 Robert J Tuite
Bibliographic Details
Claims Analysis
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |