Silica
Abstract
Abstract IMPROVED MICRO FINE SILICAS ARE PREPARED WITH MODIFIED SURFACE LAYERS. THE SURFACE MAY BE MODIFIED BY CONTROLLING THE PH OF THE SILICA SLURRY BETWEEN ABOUT 1.5 AND 12 AND PERMANENTLY AFFIXING FROM 6 TO 20% OF A SILOXANE OR SILANE BASED ON THE WEIGHT OF THE SILICA. THE SURFACE MAY BE FURTHER CONTROLLED BY VARYING THE COMPOSITION OF THE WATER LAYER ON THE SURFACE OF THE SILICA AND BY CONTROLLING THE CHOICE AND CURING OF THE SILICONE AND/OR SILICA. AN ESPECIALLY IMPROVED DEFOAMER FOR AQUEOUS SYSTEMS IS THUS FORMED BY COMPOUNDING 3 TO 30% OF THE IMPROVED HYDROPHOBIC SILICA HAVING BETWEEN ABOUT 2.5 AND 8% OF NA2O AND AN AREA BELOW ABOUT 175 M.2/G. WITH AN ORGANIC HYDROCARBON LIQUID, SAID COMPOSITION HAVING A VISCOSITY OF FROM ABOUT 10 TO 3000 CPS.
Inventors
- 👤 J Miller
- 👤 J Wills
- 👤 R Pierce
- 👤 R Linton
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |