Patent US3852404A successfully refreshed from Google Patents.
US3852404A
Expired / Lapsed
US
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Preparation of crystalline sulfides and selenides of cadmium zinc and mercury
Assignee: Hercules LLC
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Filing: 1972-10-24
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Granted: 1974-12-03
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Expires: 1992-10-24
Abstract
Abstract Well-ordered hexagonal crystalline forms of the sulfides, selenides or solid solutions of the sulfides and selenides of cadmium, zinc or mercury are produced by treating crude, amorphous precipitates of the sulfides, selenides or mixtures of sulfides and selenides with aqueous ammonium sulfide. The crystalline cadmium sulfide-containing precipitates are particularly useful as pigments.
Inventors
- 👤 J Daly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:12
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/10; C09C1/04; C09C1/06; C09C1/12; C09C1/38; C01; C01P; C01P2002/00; C01P2002/30; C01P2002/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
A PROCESS FOR CONVERTING A CRUDE, ESSENTIALLY AMORPHOUS PRECIPITATE OF CADMIUM SULFIDE, OR A MIXTURE OF CADMIUM SULFIDE AND CADMIUM SELENIDE, ZINC SULFIDE OR MERCURY SULFIDE INTO A PIGMENT HAVING AN X-RAY DIFFRACTION PATTERN CHARACTERISTIC OF THE HEXAGONAL CRYSTALLINE STRUCTURE, WHICH PROCESS COMPRISES TREATING SAID CRUDE, ESSENTIALLY AMORPHOUS PRECIPITATE WITH SUFFICIENT OF AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 5 PERCENT TO ABOUT 55 PERCENT BY WEIGHT OF AMMONIUM SULFIDE TO PROVIDE A WEIGHT RATIO O SOLUTION TO PRECIPATE OF AT LEAST 2:1 AND A WEIGHT RATIO OF AMMONIUM SULFIDE TO PRECIPITATE OF 0.1:1 TO 10:1 AT A TEMPERATURE FROM ABOUT 20*C. TO ABOUT 275* C. FOR A PERIOD OF TIME RANGING FROM ABOUT 1 TO ABOUT 6 DAYS UNTIL SAID PRECIPITATE IS CONVERTED TO THE WELL-ORDERED HEXAGONAL CRYSTALLINE STATE AND RECOVERING THE CRYSTALLINE PIGMENT SO PRODUCED.
Claim 2
Dependent Claim
136 words
A PROCESS FOR CONVERTING A CRUDE, ESSENTIALLY AMORPHOUS PRECIPITATE OF CADMIUM SULFIDE, OR A MIXTURE OF CADMIUM SULFIDE AND CADMIUM SELENIDE, ZINC SULFIDE OR MERCURY SULFIDE INTO A PIGMENT HAVING AN X-RAY DIFFRACTION PATTERN CHARACTERISTIC OF THE HEXAGONAL CRYSTALLINE STRUCTURE, WHICH PROCESS COMPRISES TREATING SAID CRUDE, ESSENTIALLY AMORPHOUS PRECIPITATE WITH SUFFICIENT OF AN AQUEOUS SOLUTION CONTAINING FROM ABOUT 5 PERCENT TO ABOUT 55 PERCENT BY WEIGHT OF AMMONIUM SULFIDE TO PROVIDE A WEIGHT RATIO O SOLUTION TO PRECIPATE OF AT LEAST 2:1 AND A WEIGHT RATIO OF AMMONIUM SULFIDE TO PRECIPITATE OF 0.1:1 TO 10:1 AT A TEMPERATURE FROM ABOUT 20*C. TO ABOUT 275* C. FOR A PERIOD OF TIME RANGING FROM ABOUT 1 TO ABOUT 6 DAYS UNTIL SAID PRECIPITATE IS CONVERTED TO THE WELL-ORDERED HEXAGONAL CRYSTALLINE STATE AND RECOVERING THE CRYSTALLINE PIGMENT SO PRODUCED.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the pigment is cadmium sulfide.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the pigment is a solid solution of cadmium sulfide and cadmium selenide.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the pigment is a solid solution of cadmium sulfide and zinc sulfide.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the pigment is a solid solution of cadmium sulfide and mercury sulfide.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the recovered crystalline pigment is washed, dried and pulverized.
References Cited (Backward Citations)
GB919048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |