Patent US2679463A successfully refreshed from Google Patents.
US2679463A
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Process for producing calcium-silicon oxide pigment and product obtained thereby
Assignee: EIDP Inc
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Filing: 1949-10-05
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Granted: 1954-05-25
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Expires: 1969-10-05
Abstract
No abstract record available.
Inventors
- 👤 Guy B Alexander
- 👤 Ralph K Iler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:13
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; B; B82; B82Y; B82Y30/00; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2004/80; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
A FINELY DIVIDED PULVERULENT CALCIUM-SILICON OXIDE MATERIAL MADE UP OF ULTIMATE PARTICLES ABOUT 20 TO 50 MILLIMICRONS IN DIAMETER THE PRODUCT HAVING AN SIO2:CAO WEIGHT RATIO ABOVE 4, NOT MORE THAN HALF THE CALICUM BEING EXTRACTABLE WITH HYDROCHLORIC ACID AT PH 2 AND AT 30* C., THE PRODUCT HAVING BEEN PREPARED BY THE SIMULTANEOUS STRIKE OF A WATER-SOLUBLE CALCIUM COMPOUND, A SOLUBLE SILICATE, AND AN INOGANIC ACID, WHICH DOES NOT FORM A SALT OF CALCIUM LESS SOLUBLE THAN CALICUM SILICATE AT A TEMPERATURE ABOVE 60* C.
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) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |