US2795485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallized alkali metasilicate hydrates
Assignee: PQ Corp
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Filing: 1952-12-24
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Granted: 1957-06-11
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Expires: 1972-12-24
Abstract
No abstract record available.
Inventors
- 👤 Manchot Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:53
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
THE PROCESS OF SHORTENING THE PERIOD REQUIRED TO MANUFACTURE GROUND CRYSTALLINE ALKALI METAL SILICATE HYDRATES WHICH CONSISTS ESSENTIALLY IN PRODUCING AN AQUEOUS ALKALI METAL METASILICATE SOLUTION HAVING A COMPOSITION CORRESPONDING TO THAT OF A HYDRATE OF SAID SILICATE, HEATING TO AN ELEVATED TEMPERATURE ABOVE THE MELTING POINT OF THE SAID HYDRATE, MIXING IN FROM ABOUT 1 TO 5% BY WEIGHT, BASED ON THE WEIGHT OF THE MIXTURE, OF AN INSOLUBLE SILICATE, FORMED BY CHEMICAL PRECIPITATION AND SELECTED FROM A MAGNESIUM AND ALIMINUM, COOLING THE MIXTURE BELOW THE MELTING POINT OF SAID HYDRATE TO SOLIDIFY IT, STORING THE RESULTING GLASSY SOLID TO CAUSE CRYSTALLIZATION OF THE HYDRATE AND THEN GRINDING; THE STORAGE PERIOD REQUIRED BEING SUBSTANTIALLY SHORTER THAN THAT WHICH WOULD BE REQUIRED IN THE ABSENCE OF SAID INSOLUBLE SILICATE.
Claim 2
Dependent Claim
129 words
THE PROCESS OF SHORTENING THE PERIOD REQUIRED TO MANUFACTURE GROUND CRYSTALLINE ALKALI METAL SILICATE HYDRATES WHICH CONSISTS ESSENTIALLY IN PRODUCING AN AQUEOUS ALKALI METAL METASILICATE SOLUTION HAVING A COMPOSITION CORRESPONDING TO THAT OF A HYDRATE OF SAID SILICATE, HEATING TO AN ELEVATED TEMPERATURE ABOVE THE MELTING POINT OF THE SAID HYDRATE, MIXING IN FROM ABOUT 1 TO 5% BY WEIGHT, BASED ON THE WEIGHT OF THE MIXTURE, OF AN INSOLUBLE SILICATE, FORMED BY CHEMICAL PRECIPITATION AND SELECTED FROM A MAGNESIUM AND ALIMINUM, COOLING THE MIXTURE BELOW THE MELTING POINT OF SAID HYDRATE TO SOLIDIFY IT, STORING THE RESULTING GLASSY SOLID TO CAUSE CRYSTALLIZATION OF THE HYDRATE AND THEN GRINDING; THE STORAGE PERIOD REQUIRED BEING SUBSTANTIALLY SHORTER THAN THAT WHICH WOULD BE REQUIRED IN THE ABSENCE OF SAID INSOLUBLE SILICATE.
Claim 3
Dependent Claim
42 words
AS A NEW COMPOSITION OF MATTER A HETEROGENEOUS MIXTURE CONSISTING OF (1) CRYSTALLIZED SODIUM METASILICATE HYDRATE AND (2) 1-5% OF A CRYSTALLIZED INSOLUBLE SILICATE SELECTED FROM THE GROUP CONSISTING OF THE CHEMICALLY PRECIPITATED SILICATES OF THE ALKALINE EARTH METALS, MAGNESIUM AND ALUMINUM.
Claim 4
Dependent Claim
42 words
AS A NEW COMPOSITION OF MATTER A HETEROGENEOUS MIXTURE CONSISTING OF (1) CRYSTALLIZED SODIUM METASILICATE HYDRATE AND (2) 1-5% OF A CRYSTALLIZED INSOLUBLE SILICATE SELECTED FROM THE GROUP CONSISTING OF THE CHEMICALLY PRECIPITATED SILICATES OF THE ALKALINE EARTH METALS, MAGNESIUM AND ALUMINUM.
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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) | 1960-06-10 | 1960-12-10 | 1961-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-10 | 1964-12-10 | 1965-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-10 | 1968-12-10 | 1969-06-11 | $7700.00 | Window Closed / Lapsed |