US3677784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing hydrophobic silica
Assignee: Wacker Chemie AG
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Filing: 1970-01-21
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Granted: 1972-07-18
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Expires: 1990-01-21
Abstract
Abstract HYDROPHOBIC SILICA FILLER FOR SILICONE RUBBER STOCKS CAN BE PREPARED BY REACTING ORGANOHALOGENOSILANES WITH FINELY DIVIDED SILICA IN AN AQUEOUS SILICASOL AT A PH IN THE RANGE FROM 8.0 TO 10.8.
Inventors
- 👤 Siegfried Nitzsche
- 👤 Wolfgang Kaiser
- 👤 Ernst Wohlfarth
- 👤 Paul Hittmair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:25
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/10; C04B20/1051; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/146; C01B33/149; C08; C08K; C08K9/00; C08K9/04; C08K9/06
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |