US2643196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pure cadmium red pigment
Assignee: Akzo Nobel Paints LLC
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Filing: 1949-03-11
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Granted: 1953-06-23
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Expires: 1969-03-11
Abstract
No abstract record available.
Inventors
- 👤 Benjamin W Allan
- 👤 Frank O Rummery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:46
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/10; C09C1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
208 words
THE METHOD OF MAKING A CADMIUM SULFOSELENIDE PIGMENT, WHICH METHOD COMPRISES: CALCINING IN A NON-OXIDIZING ATMOSPHERE AT TEMPERATURES BETWEEN ABOUT 400* C. AND 700* C., AN INTIMATELY MIXED CRUDE PIGMENT MASS COMPOSED ESSENTIALLY OF CADMIUM SULFIDE, AND INSOLUBLE OXIDIC CADMIUM COMPOUND AND SELENIUM, THE OXIDIC CADMIUM COMPOUND BEING PRESENT IN SUFFICIENT QUANTITY TO PROVIDE AT LEAST 1/2% OF CADMIUM OXIDE BY WEIGHT OF THE CRUDE PIGMENT MASS, THE SELENIUM BEING PRESENT IN SUFFICIENT QUANTITY TO PROVIDE A MOLAR RATIO FO SELENIUM TO CADMIUM OXIDE OF AT LEAST 3 TO 2, AND THE CADMIUM SULFIDE BEING PRESENT IN SUFFICIENT QUANTITY ABOVE A MOLAR RATIO OF CDS: SE OF 1 TO 3 TO PRODUCE THE DESIRED SHADE OF RED, AT LEAST THE CADMIUM SULFIDE AND THE OXIDIC CADMIUM COMPOUND IN SAID MASS HAVING BEEN FORMED IN SITU AND COPRECIPITATED AS THE DIRECT INSOLUBLE PRODUCTS OF A SINGLE STRIKE BETWEEN: (A) AN AQUEOUS SOLUTION OF A CADIUM SALT AS ONE STRIKE COMPONENT, AND (B) A MIXED AQUEOUS SOLUTION AS THE OTHER STRIKE COMPONENT, SAID MIXED SOLUTION CONTAINING A SOLUBLE OXIDIC ALKALINE-REACTING COMPOUND WHOSE ANION FORMS WITH CADMIUM IONS AN INSOLUBLE OXIDIC CADMIUM COMPOUND, AND A SOLUBLE SULFIDE WHOSE CATIONS YIELD WATER-SOLUBLE COMPOUNDS WHEN COMBINED WITH THE ANION OF SAID CADMIUM SALT.
Claim 2
Independent Claim
208 words
THE METHOD OF MAKING A CADMIUM SULFOSELENIDE PIGMENT, WHICH METHOD COMPRISES: CALCINING IN A NON-OXIDIZING ATMOSPHERE AT TEMPERATURES BETWEEN ABOUT 400* C. AND 700* C., AN INTIMATELY MIXED CRUDE PIGMENT MASS COMPOSED ESSENTIALLY OF CADMIUM SULFIDE, AND INSOLUBLE OXIDIC CADMIUM COMPOUND AND SELENIUM, THE OXIDIC CADMIUM COMPOUND BEING PRESENT IN SUFFICIENT QUANTITY TO PROVIDE AT LEAST 1/2% OF CADMIUM OXIDE BY WEIGHT OF THE CRUDE PIGMENT MASS, THE SELENIUM BEING PRESENT IN SUFFICIENT QUANTITY TO PROVIDE A MOLAR RATIO FO SELENIUM TO CADMIUM OXIDE OF AT LEAST 3 TO 2, AND THE CADMIUM SULFIDE BEING PRESENT IN SUFFICIENT QUANTITY ABOVE A MOLAR RATIO OF CDS: SE OF 1 TO 3 TO PRODUCE THE DESIRED SHADE OF RED, AT LEAST THE CADMIUM SULFIDE AND THE OXIDIC CADMIUM COMPOUND IN SAID MASS HAVING BEEN FORMED IN SITU AND COPRECIPITATED AS THE DIRECT INSOLUBLE PRODUCTS OF A SINGLE STRIKE BETWEEN: (A) AN AQUEOUS SOLUTION OF A CADIUM SALT AS ONE STRIKE COMPONENT, AND (B) A MIXED AQUEOUS SOLUTION AS THE OTHER STRIKE COMPONENT, SAID MIXED SOLUTION CONTAINING A SOLUBLE OXIDIC ALKALINE-REACTING COMPOUND WHOSE ANION FORMS WITH CADMIUM IONS AN INSOLUBLE OXIDIC CADMIUM COMPOUND, AND A SOLUBLE SULFIDE WHOSE CATIONS YIELD WATER-SOLUBLE COMPOUNDS WHEN COMBINED WITH THE ANION OF SAID CADMIUM SALT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |