US3785806A
Expired / Lapsed
US
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Method of producing arsenic selenides and arsenic doped selenium
Assignee: Boliden AB
•
Filing: 1972-02-28
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Granted: 1974-01-15
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Expires: 1992-02-28
Abstract
Abstract A process for producing arsenic doped selenium. Finely divided selenium is mixed with a finely divided arsenic in an atomic ratio of 1:4, whereafter the mixture is heated in an inert atmosphere to obtain a master alloy. The master alloy is then mixed with molten pure selenium in a manner to obtain an arsenic content of between 0.1 and 2 percent by weight in the selenium.
Inventors
- 👤 S Henriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:45
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08207; C; C01; C01B; C01B19/00; C01B19/007; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2002/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
A method according to claim 1, wherein arsenic-tetra selenide is purified of oxygen prior to the doping of the selenium.
Claim 2
Dependent Claim
29 words
A method according to claim 1, wherein prior to doping the selenium with arsenic, the arsenic tetra selenide has a content of oxygen less than 5 grams per ton.
Claim 3
Dependent Claim
27 words
The process as set forth in claim 1 wherein the melt is formed by mixing the master alloy in solid form with a melt of pure selenium.
Claim 4
Dependent Claim
27 words
The process as set forth in claim 1 wherein the melt is formed by mixing the master alloy in liquid form with a melt of pure selenium.
Claim 5
Dependent Claim
34 words
The process as set forth in claim 1 wherein the melt is formed by mixing the master alloy in solid form with the pure selenium in solid form and then melting the resulting mixture.
Claim 6
Dependent Claim
33 words
The process as set forth in claim 1 wherein the melt is formed by mixing the master alloy in liquid form with the pure selenium in solid form and heating the resulting mixture.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |