Patent US2716546A successfully refreshed from Google Patents.
Patent US3034913A successfully refreshed from Google Patents.
US3034913A
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Process for the preparation of siliceous pigment
Assignee: PPG Industries Inc
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Filing: 1959-05-05
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Granted: 1962-05-15
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Expires: 1979-05-05
Abstract
No abstract record available.
Inventors
- 👤 Gosta B Lagerstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:33
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/675; D21H17/68; D21H19/00; D21H19/36; D21H19/38; D21H19/40; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD OF PREPARING FINELY DIVIDED SILICEOUS PIGMENT WHICH COMPRISES PARTIALLY NEUTRALIZING ALKALI METAL SILICATE WITH AN ACIDIFYING AGENT TO PROVIDE AN AQUEOUS SILICEOUS SOLUTION HAVING A TENDENCY ITSELF TO PRECIPITATE SILICEOUS MATERIAL AND PRECIPITATING SILICEOUS PIGMENT FROM THE SOLUTION BY MIXING WATER SOLUBLE INORGANIC SALT AND THE SOLUTION SUBSEQUENT TO ITS FORMATION BY SAID PARTIAL NEUTRALIZATION BUT BEFORE CONSEQUENTIAL PRECIPITATION OCCURS IN THE SOLUTION DUE TO SAID TENDENCY.
Claim 2
Independent Claim
69 words
A METHOD OF PREPARING FINELY DIVIDED SILICEOUS PIGMENT WHICH COMPRISES PARTIALLY NEUTRALIZING ALKALI METAL SILICATE WITH AN ACIDIFYING AGENT TO PROVIDE AN AQUEOUS SILICEOUS SOLUTION HAVING A TENDENCY ITSELF TO PRECIPITATE SILICEOUS MATERIAL AND PRECIPITATING SILICEOUS PIGMENT FROM THE SOLUTION BY MIXING WATER SOLUBLE INORGANIC SALT AND THE SOLUTION SUBSEQUENT TO ITS FORMATION BY SAID PARTIAL NEUTRALIZATION BUT BEFORE CONSEQUENTIAL PRECIPITATION OCCURS IN THE SOLUTION DUE TO SAID TENDENCY.
References 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) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |