US3714339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing metallic selenides
Assignee: BDH Chemicals Ltd
•
Filing: 1970-11-03
•
Granted: 1973-01-30
•
Expires: 1990-11-03
Abstract
Abstract A process for the preparation of metallic selenides is provided which comprises homogeneous precipitation of a selenide from a solution of a compound of the metal and a compound of selenium. Zinc and cadmium selenides are particularly produced. The products are of high purity and have extremely homogeneous properties.
Inventors
- 👤 A Vecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:48
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/88; C09K11/881; C01; C01B; C01B19/00; C01B19/007; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A process for the production of a metallic selenide selected from the group consisting of zinc selenide, cadmium selenide and mixtures thereof which comprises dissolving a compound of at least one of said metals and a non-gaseous selenium compound in dimethylformamide, said selenium compound being one which is decomposible in the dimethylformamide upon heating to yield selenium ions, and heating said solution to cause said selenium compound to decompose whereby the selenide ions and metal ions react and the resulting metallic selenide is homogeneously precipitated from solution.
Claim 2
Dependent Claim
87 words
A process for the production of a metallic selenide selected from the group consisting of zinc selenide, cadmium selenide and mixtures thereof which comprises dissolving a compound of at least one of said metals and a non-gaseous selenium compound in dimethylformamide, said selenium compound being one which is decomposible in the dimethylformamide upon heating to yield selenium ions, and heating said solution to cause said selenium compound to decompose whereby the selenide ions and metal ions react and the resulting metallic selenide is homogeneously precipitated from solution.
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1 in which the compound of the metal is zinc acetate or cadmium acetate.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 1 in which the compound of the metal is a salt.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 3 in which the salt is a salt of an organic acid.
Claim 6
Dependent Claim
44 words
A process as claimed in claim 1 in which the compound of selenium is selenourea or a substituted selenourea or a derivative of said urea or substituted urea in which the two nitrogen atoms of the urea molecule form part of a ring system.
Claim 7
Dependent Claim
31 words
A process as claimed in claim 1 in which the selenide is obtained as a complex with dimethylformamide and the dimethylformamide is removed from this complex to provide said metallic selenide.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 1 in which the precipitation takes place also in the presence of thiourea.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |