Patent US4645619A successfully refreshed from Google Patents.
US4645619A
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US
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Process for the preparation of colloidal dispersions of chalcogens and chalcogenide alloys
Assignee: Xerox Corp
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Filing: 1985-05-28
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Granted: 1987-02-24
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Expires: 2005-05-28
Abstract
Abstract Disclosed is an improved process for the preparation of a stable colloidal dispersion of a selenium tellurium alloy, which comprises providing a solution with a polymer therein; adding to the solution a selenium ester and a tellurium ester; and subsequently subjecting the resulting mixture to a reduction reaction by adding thereto a reducing agent whereby there is generated selenium tellurium particles of a diameter of from about 0.01 micron to about 0.3 micron in solution.
Inventors
- 👤 Santokh S. Badesha
- 👤 Thomas W. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:07
CPC Classifications
B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0026; B82; B82Y; B82Y30/00; C; C01; C01B; C01B19/00; C01B19/04; G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/082; G03G5/08207; C01P; C01P2004/00; C01P2004/60; C01P2004/62; C01P2004/64
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
An improved process for the preparation of a stable colloidal dispersion of a selenium tellurium alloy, which comprises providing a solution with a polymer therein; adding to the solution a selenium ester and a tellurium ester; and subsequently subjecting the resulting mixture to a reduction reaction by adding thereto a reducing agent whereby there is generated selenium tellurium particles of a diamater of from about 0.01 microns to about 0.3 microns in solution.
Claim 2
Dependent Claim
73 words
An improved process for the preparation of a stable colloidal dispersion of a selenium tellurium alloy, which comprises providing a solution with a polymer therein; adding to the solution a selenium ester and a tellurium ester; and subsequently subjecting the resulting mixture to a reduction reaction by adding thereto a reducing agent whereby there is generated selenium tellurium particles of a diamater of from about 0.01 microns to about 0.3 microns in solution.
Claim 3
Dependent Claim
30 words
A process in accordance with claim 1 wherein the polymer is selected from the group consisting of a vinyl resin, a polyurethane, a polyester, an epoxy, and a polyhydroxyether composition.
Claim 4
Dependent Claim
24 words
A process in accordance with claim 1 wherein the solution solvent is selected from the group consisting of Cellosolve®, benzene, toluene, ethanol and methanol.
Claim 5
Dependent Claim
21 words
A process in accordance with claim 1 wherein the selenium ester is diethyl selenite, and the tellurium ester is tetraethoxy tellurane.
Claim 6
Dependent Claim
20 words
A process in accordance with claim 1 wherein the reducing agent added to the solution is hydrazine or sulfur dioxide.
Claim 7
Dependent Claim
38 words
A process in accordance with claim 1 wherein the selenium tellurium alloy comprises from about 1 percent to about 99 percent by weight of selenium, and from about 99 percent to about 1 percent by weight of tellurium.
Claim 8
Dependent Claim
31 words
A process in accordance with claim 1 wherein the polymer is present in the solution in an amount of from about 1 part by weight to about 40 parts by weight.
Claim 9
Dependent Claim
30 words
A process in accordance with claim 1 wherein the dispersion contains from about 1 percent by weight to about 30 percent by weight of particles of a selenium tellurium alloy.
Claim 10
Dependent Claim
24 words
A process in accordance with claim 1 wherein the reduction is accomplished at a temperature of from about 25° C. to about 100° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |