US2496587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cadmium sulfo-selenide reactants
Assignee: Wyeth Holdings LLC
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Filing: 1946-06-28
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Granted: 1950-02-07
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Expires: 1966-06-28
Abstract
No abstract record available.
Inventors
- 👤 Guy C Marcot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:15
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/10; C09C1/12; C01; C01P; C01P2002/00; C01P2002/50; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN MAKING CADMIUM RED PIGMENTS, THE METHOD OF IMPROVING THE SELENIUM CONVERSION AND COLOR VALUES WHICH COMPRISES, FORMING A CALINABLE COMPOSITE COMPRISING AN ADMIXTURE OF CADMIUM SULFIDE, METALLIC SELENIUM AND A CADMIUM OXIDE REACTANT, SAID REACTANT BEING SELECTED FROM THE GROUP CONSISTING OF CADMIUM OXIDE AND COMPOUNDS YIELDING CADMIUM OXIDE UNDER CALCINATION CONDITIONS, SAID COMPOSITE BEING FREE FROM UNCOMBINED SULFUR AND HAVING A MOL RATIO OF METALLIC SELENIUM: CADMIUM OXIDE OF 3:2 AND A CADMIUM SULFIDE: METALIC SELENIUM RATIO OF AT LEAST 1:3 WHEREBY LIBERATION OF FREE SULFUR DURING CALCINATION IS PREVENTED, AND CALCINING SAID COMPOSITE.
Claim 2
Dependent Claim
96 words
IN MAKING CADMIUM RED PIGMENTS, THE METHOD OF IMPROVING THE SELENIUM CONVERSION AND COLOR VALUES WHICH COMPRISES, FORMING A CALINABLE COMPOSITE COMPRISING AN ADMIXTURE OF CADMIUM SULFIDE, METALLIC SELENIUM AND A CADMIUM OXIDE REACTANT, SAID REACTANT BEING SELECTED FROM THE GROUP CONSISTING OF CADMIUM OXIDE AND COMPOUNDS YIELDING CADMIUM OXIDE UNDER CALCINATION CONDITIONS, SAID COMPOSITE BEING FREE FROM UNCOMBINED SULFUR AND HAVING A MOL RATIO OF METALLIC SELENIUM: CADMIUM OXIDE OF 3:2 AND A CADMIUM SULFIDE: METALIC SELENIUM RATIO OF AT LEAST 1:3 WHEREBY LIBERATION OF FREE SULFUR DURING CALCINATION IS PREVENTED, AND CALCINING SAID COMPOSITE.
References Cited (Backward Citations)
US2115080A
Cited
US2248408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |