US3730749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing silica pigment
Assignee: PPG Industries Inc
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Filing: 1971-03-10
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Granted: 1973-05-01
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Expires: 1991-03-10
Abstract
Abstract THE SUBSTANTIAL VISCOSITY INCREASE WHICH OCCURS DURING THE ACIDIFICATION OR NEUTRALIZATION OF AQUEOUS ALKALI METAL SILICATE IS SUBSTANTIALLY MINIMIZED BY ADDING A CONTROLLED AMOUNT OF AN ALKALI METAL SILICATE.
Inventors
- 👤 J Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:12
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |