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US4514322A
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Phosphorous-doped tin oxide powder
Assignee: EIDP Inc
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Filing: 1984-04-19
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Granted: 1985-04-30
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Expires: 2004-04-19
Abstract
Abstract Phosphorus-doped tin oxide provides conductive powder of light coloration.
Inventors
- 👤 Thomas J. Swoboda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:22
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/02; D; D01; D01F; D01F1/00; D01F1/02; D01F1/09; H; H01; H01B; H01B1/00; H01B1/06; H01B1/08; H01B1/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
Process for preparing a powder of phosphorus-doped tin oxide comprising the steps (a) combining dehydrated metastannic acid with red phosphorus in proportions to provide from about 1 to 4 atom % phosphorus in the doped tin oxide and sand milling the composition in an azeotropic liquid comprising methanol in trichlorotrifluoroethane, (b) evaporating the azeotropic liquid from the product obtained in (a), (c) separating the milled phosphorus and tin oxide mixture from the sand, and (d) heating the mixture of phosphorus and tin oxide in an inert gas at a temperature within the range of 450° C. to 700° C. and for a time sufficient to obtain a phosphorus-doped tin oxide powder having a conductivity of at least 0.1 ohm -1 cm -1 at a density of 3.48 g/cm 3 .
Claim 2
Dependent Claim
130 words
Process for preparing a powder of phosphorus-doped tin oxide comprising the steps (a) combining dehydrated metastannic acid with red phosphorus in proportions to provide from about 1 to 4 atom % phosphorus in the doped tin oxide and sand milling the composition in an azeotropic liquid comprising methanol in trichlorotrifluoroethane, (b) evaporating the azeotropic liquid from the product obtained in (a), (c) separating the milled phosphorus and tin oxide mixture from the sand, and (d) heating the mixture of phosphorus and tin oxide in an inert gas at a temperature within the range of 450° C. to 700° C. and for a time sufficient to obtain a phosphorus-doped tin oxide powder having a conductivity of at least 0.1 ohm -1 cm -1 at a density of 3.48 g/cm 3 .
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the azeotropic is a mixture of 5.7% methanol in trichlorotrifluoroethane.
Claim 4
Dependent Claim
30 words
The process of claim 1 wherein a sufficient amount of red phosphorus is added in step (a) to provide about 2 atom % of phosphorus in the doped tin oxide.
Claim 5
Dependent Claim
47 words
Phosphorus-doped tin oxide powder exhibiting a conductivity of at least 0.1 ohm -1 cm -1 at a density of 3.48 g/cm 3 , said powder having a particle size within the range of 0.02 to 1.5 microns and containing from about 1 to 4 atom % phosphorus.
Claim 6
Dependent Claim
47 words
Phosphorus-doped tin oxide powder exhibiting a conductivity of at least 0.1 ohm -1 cm -1 at a density of 3.48 g/cm 3 , said powder having a particle size within the range of 0.02 to 1.5 microns and containing from about 1 to 4 atom % phosphorus.
Claim 7
Dependent Claim
18 words
The product of claim 4 having a particle size within the range of about 0.1 to 1 micron.
Claim 8
Dependent Claim
13 words
The product of claim 4 containing from 1.5 to 2.0 atom % phosphorus.
Claim 9
Dependent Claim
28 words
A conductive composition comprising the powder of claim 4 dispersed in a thermoplastic synthetic polymer in an amount of about 65 to 75% by weight of the composition.
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) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |