US4937148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing conductive fine particles
Assignee: JGC Catalysts and Chemicals Ltd
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Filing: 1989-05-01
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Granted: 1990-06-26
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Expires: 2009-05-01
Abstract
Abstract Transparent conductive coatings excellent in transparency are provided on substrates such as glass, plastics, etc. by the use of conductive coating materials obtained by maintaining aqueous solutions of hydrolyzable tin containing or indium containing compounds at pH of 8-12, and gradually hydrolyzing said compounds in the solutions to form sols containing colloidal particles, followed by drying and calcining.
Inventors
- 👤 Goro Sato
- 👤 Michio Komatsu
- 👤 Tsuguo Koyanagi
- 👤 Masayuki Matsuda
- 👤 Hiroo Yoshidome
- 👤 Akira Nakashima
- 👤 Kazuaki Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:12
CPC Classifications
C; C01; C01G; C01G19/00; C01G19/02; C01G15/00; C09; C09D; C09D5/00; C09D5/24; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08; H01B1/20; C01P; C01P2002/00; C01P2002/50; C01P2002/52; C01P2002/54; Y; Y10; Y10S; Y10S428/00; Y10S428/918; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A process for preparing conductive particles having a specific surface area of less than 50 m 2 /g which comprises hydrolyzing a hydrolyzable tin containing or indium containing compound in an aqueous solution while controlling the pH of said solution substantially constant within the range of from 8-12 that an aqueous sol containing colloidal particles maybe formed, followed by separation, drying and calcination of the colloidal particles.
Claim 2
Dependent Claim
67 words
A process for preparing conductive particles having a specific surface area of less than 50 m 2 /g which comprises hydrolyzing a hydrolyzable tin containing or indium containing compound in an aqueous solution while controlling the pH of said solution substantially constant within the range of from 8-12 that an aqueous sol containing colloidal particles maybe formed, followed by separation, drying and calcination of the colloidal particles.
Claim 3
Dependent Claim
104 words
A process for preparing conductive particles having a specific area of less than 50 m 2 /g which comprises providing a starting aqueous solution of a hydrolyzable tin containing or indium containing compound and an aqueous hydrolyzing solution of a pH of from 8 to 12, adding said starting aqueous solution to said hydrolyzing aqueous solution together with an alkali or acid under stirring while controlling the pH of said hydrolyzing aqueous solution substantially constant within the range of from 8 to 12 so that an aqueous sol containing colloidal particles may be formed, followed by separation, drying, and calcination of the colloidal particles.
Claim 4
Dependent Claim
104 words
A process for preparing conductive particles having a specific area of less than 50 m 2 /g which comprises providing a starting aqueous solution of a hydrolyzable tin containing or indium containing compound and an aqueous hydrolyzing solution of a pH of from 8 to 12, adding said starting aqueous solution to said hydrolyzing aqueous solution together with an alkali or acid under stirring while controlling the pH of said hydrolyzing aqueous solution substantially constant within the range of from 8 to 12 so that an aqueous sol containing colloidal particles may be formed, followed by separation, drying, and calcination of the colloidal particles.
Claim 5
Dependent Claim
32 words
The process as set forth in claim 1 or 2 wherein the tin containing compound is potassium stannate or sodium stannate, and the indium containing compound is indium nitrate or indium sulfate.
Claim 6
Dependent Claim
22 words
The process as set fourth in claim 1 or 2 wherein the hydrolysis at a temperature of carried out is 30°-90° C.
Claim 7
Dependent Claim
26 words
The process as set forth in claim 1 or 2 wherein an average particle diameter of the colloidal particles formed by the hydrolysis is 0.05-0.3 μm.
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |