Patent US4775412A successfully refreshed from Google Patents.
US4775412A
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Aqueous sol of crystalline tin oxide solid solution containing antimony, and production thereof
Assignee: Taki Chemical Co Ltd
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Filing: 1987-03-09
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Granted: 1988-10-04
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Expires: 2007-03-09
Abstract
Abstract An aqueous sol of a crystalline tin oxide solid solution containing antimony and having a particle size not larger than 300Å is prepared by adding an alkali metal bicarbonate or ammonium bicarbonate to an acidic aqueous solution containing a compound of tin and a compound of antimony to form a gel; purifying the gel; adding aqueous ammonia to the purified gel to form a slurry; and heating the slurry until a sol is formed.
Inventors
- 👤 Hiroshi Nishikura
- 👤 Shin Yamamoto
- 👤 Yukio Terao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:45
CPC Classifications
C; C01; C01G; C01G30/00; C01G19/00; C01G19/02; Y; Y10; Y10S; Y10S516/00; Y10S516/924; Y10S516/925
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
32 words
An aqueous sol of crystalline tin oxide solid solution containing antimony in the form of fine particles having a particle diameter of not larger than 300 Åthe molar ratio Sb/Sn being 0.005-0.3.
Claim 2
Dependent Claim
32 words
An aqueous sol of crystalline tin oxide solid solution containing antimony in the form of fine particles having a particle diameter of not larger than 300 Åthe molar ratio Sb/Sn being 0.005-0.3.
Claim 3
Independent Claim
96 words
A method of producing an aqueous sol of a crystalline tin oxide solid solution containing antimony and having a particle size not larger than 300Å, which comprsies: adding an alkali metal bicarbonate or ammonium bicarbonate to an acidic aqeous solution containing a compound of tin and a compound of antimony dissolved therein, wherein the ration of Sb/Sn is in the range of 0.005 to 0.3, to form a gel; removing impurities from the gel; adding aqueous ammonia to the purified gel to form a gel slurry; and heating the gel slurry until said sol is formed.
Claim 4
Independent Claim
96 words
A method of producing an aqueous sol of a crystalline tin oxide solid solution containing antimony and having a particle size not larger than 300Å, which comprsies: adding an alkali metal bicarbonate or ammonium bicarbonate to an acidic aqeous solution containing a compound of tin and a compound of antimony dissolved therein, wherein the ration of Sb/Sn is in the range of 0.005 to 0.3, to form a gel; removing impurities from the gel; adding aqueous ammonia to the purified gel to form a gel slurry; and heating the gel slurry until said sol is formed.
Claim 5
Dependent Claim
25 words
A method according to claim 2 wherein the pH of the solution at the end of the gel formation reaction is not lower than 6.0.
Claim 6
Dependent Claim
23 words
A method according to claim 2 wherein the aqueous ammonia is added to the gel so as to bring the pH to 8-12.
Claim 7
Dependent Claim
25 words
A method according to claim 2, wherein the gel slurry is heated in a closed system at a temperature of 100°-230° C. for 2-10 hours.
Claim 8
Dependent Claim
16 words
A method according to claim 2, wherein impurities are removed by washing the gel with water.
Claim 9
Dependent Claim
19 words
A method accirding to claim 2, wherein impurities are removed by contacting the gel with an ionic exchange resin.
References Cited (Backward Citations)
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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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |