US3433593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing finely-divided precipitated silica
Assignee: Evonik Operations GmbH
•
Filing: 1966-06-24
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Granted: 1969-03-18
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Expires: 1986-06-24
Abstract
No abstract record available.
Inventors
- 👤 Helmut Reinhardt
- 👤 Peter Nauroth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:49
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; B; B82; B82Y; B82Y30/00; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2280649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-17 | 1972-09-16 | 1973-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-17 | 1976-09-16 | 1977-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-17 | 1980-09-16 | 1981-03-18 | $7700.00 | Window Closed / Lapsed |