US4460408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of chalcogenide alloys by coreduction of esters
Assignee: Xerox Corp
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Filing: 1982-08-05
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Granted: 1984-07-17
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Expires: 2002-08-05
Abstract
Abstract This invention is generally directed to a process for the preparation of chalcogenide alloys of the elements of Groups VA to VIA of the Periodic Table, in high purity, (99.999 percent) which comprises providing pure esters of the alloys desired, and subsequently simultaneously subjecting the esters to a coreduction reaction. The esters can be obtained by treating the corresponding oxides with an alcohol of diol. Examples of alloys produced in accordance with the process of the present invention include selenium arsenic, selenium sulfur selenium tellurium, selenium tellurium arsenic, selenium sulfur tellurium, and the like.
Inventors
- 👤 Santokh S. Badesha
- 👤 Thomas W. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:02
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/007; C01B19/002; C01B19/02; C01P; C01P2002/00; C01P2002/70; C01P2002/80; C01P2002/88; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2004/82; C01P2004/84; C01P2004/86; C01P2006/00; C01P2006/60; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
31 words
A process for the preparation of chalcogenide alloys in high purity which comprises providing pure esters of the desired chalcogenide, and subsequently subjecting the mixture of esters to a coreduction reaction.
Claim 2
Dependent Claim
31 words
A process for the preparation of chalcogenide alloys in high purity which comprises providing pure esters of the desired chalcogenide, and subsequently subjecting the mixture of esters to a coreduction reaction.
Claim 3
Dependent Claim
24 words
A process in accordance with claim 1 wherein a mixture of the pure esters of selenium and tellurium are subjected to a coreduction reaction.
Claim 4
Dependent Claim
24 words
A process in accordance with claim 1 wherein a mixture of the pure esters of selenium and arsenic are subjected to a coreduction reaction.
Claim 5
Dependent Claim
25 words
A process in accordance with claim 1 wherein a mixture of the pure esters of selenium, tellurium and arsenic are subjected to a coreduction reaction.
Claim 6
Dependent Claim
25 words
A process in accordance with claim 1 wherein a mixture of the pure esters of selenium, tellurium, and sulfur are subjected to a coreduction reaction.
Claim 7
Dependent Claim
76 words
A process in accordance with claim 2 wherein the selenium ester is of the formula (RO) 2 SeO, the tellurium ester is of the formula (RO) 4 Te, or ##STR9## the arsenic ester is of the formula (OCH 2 ) 2 As-CH 2 CH 2 OAs (OCH 2 ) 2 , and the sulfur ester is of the formula (RO) 2 SO, wherein R is an alkyl group, and Z is an aliphatic or aromatic moiety.
Claim 8
Dependent Claim
16 words
A process in accordance with claim 1 wherein the reducing agent is hydrazine or sulfur dioxide.
Claim 9
Dependent Claim
43 words
A process in accordance with claim 1 wherein the desired esters are obtained by reacting the corresponding metal oxides, with the materials selected from glycols or alcohols, or by reacting metallic chlorides, with alcohols, in the presence of alkoxides corresponding to the alcohols.
Claim 10
Dependent Claim
25 words
A process in accordance with claim 5 wherein the tellurium and arsenic esters are obtained by the condensation of the corresponding oxides with a diol.
Claim 11
Dependent Claim
23 words
A process in accordance with claim 1 wherein the selenium esters are obtained by reacting selenous acid or selenium oxide with an alcohol.
Claim 12
Dependent Claim
14 words
A process in accordance with claim 1 wherein there results a selenium arsenic alloy.
Claim 13
Dependent Claim
15 words
A process in accordance with claim 1 wherein there results a selenium tellurium arsenic alloy.
Claim 14
Dependent Claim
14 words
A process in accordance with claim 1 wherein there results a selenium sulfur alloy.
Claim 15
Dependent Claim
15 words
A process in accordance with claim 1 wherein there results a selenium, tellurium, sulfur alloy.
Claim 16
Dependent Claim
14 words
A process in accordance with claim 1 wherein there results a tellurium sulfur alloy.
Claim 17
Dependent Claim
16 words
A process in accordance with claim 1 wherein there results a selenium sulfur tellurium arsenic alloy.
Claim 18
Dependent Claim
31 words
A process in accordance with claim 1 wherein there results a selenium arsenic alloy of the formula Se.sub.1- As.sub.x wherein x is a number ranging from about 0.1 to about 0.99.
Claim 19
Dependent Claim
22 words
A process in accordance with claim 19 wherein there results a selenium arsenic alloy contains 99.95 percent selenium, and 0.5 percent arsenic.
Claim 20
Dependent Claim
27 words
A process in accordance with claim 1 wherein the reduction reaction is accomplished at a temperature ranging from about 25 degrees Centigrade to about 100 degrees Centigrade.
Claim 21
Dependent Claim
13 words
A process in accordance with claim 9 wherein the diol is ethylene glycol.
Claim 22
Dependent Claim
14 words
A process in accordance with claim 10 wherein the alcohol is methanol or ethanol.
Claim 23
Dependent Claim
30 words
A process in accordance with claim 17, wherein there results a selenium arsenic alloy containing about 95 percent by weight of selenium, and about 5 percent by weight of arsenic.
Claim 24
Dependent Claim
14 words
A process in accordance with claim 1, wherein there results a selenium tellurium alloy.
Claim 25
Dependent Claim
40 words
A process in accordance with claim 23 wherein the alloy contains from about 70 percent by weight to about 90 percent by weight of selenium, and from about 10 percent by weight to about 30 percent by weight of tellurium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |