US5223033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paste formulations for use in the electronics industry
Assignee: Vesuvius Holdings Ltd
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Filing: 1992-04-27
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Granted: 1993-06-29
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Expires: 2012-04-27
Abstract
Abstract In a paste for use in the electronics industry which comprises: i) a non aqueous vehicle; and ii) a particulate filler material, the improvement which comprises the vehicle being a stable emulsion of at least two immiscible organic liquids of at least 50% by volume disperse phase, one of which liquids is selected from the group consisting of a polar solvent and a mixture of polar solvents, and the other of which liquids is selected from the group consisting of an aliphatic hydrocarbon and a mixture of aliphatic hydrocarbons and the paste, when heated to remove the vehicle therefrom yields less than 3.0% by weight of organic residues based on the weight of the paste.
Inventors
- 👤 Charles E. King
- 👤 Andrew C. Mackie
- 👤 Geoffrey A. Paterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:39
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612; C; C23; C23C; C23C24/00; C23C24/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
In a paste for use in the electronics industry which comprises: i) a non aqueous vehicle; and ii) a particulate filler material, the improvement which comprises the vehicle being a stable emulsion of at least two immiscible organic liquids of at least 50% by volume disperse phase, one of which liquids is selected from the group consisting of a polar solvent and a mixture of polar solvents, and the other of which liquids is selected from the group consisting of an aliphatic hydrocarbon and a mixture of aliphatic hydrocarbons and the paste, when heated to remove the vehicle therefrom yields less than 3.0% by weight of organic residues based on the weight of the paste.
Claim 2
Dependent Claim
115 words
In a paste for use in the electronics industry which comprises: i) a non aqueous vehicle; and ii) a particulate filler material, the improvement which comprises the vehicle being a stable emulsion of at least two immiscible organic liquids of at least 50% by volume disperse phase, one of which liquids is selected from the group consisting of a polar solvent and a mixture of polar solvents, and the other of which liquids is selected from the group consisting of an aliphatic hydrocarbon and a mixture of aliphatic hydrocarbons and the paste, when heated to remove the vehicle therefrom yields less than 3.0% by weight of organic residues based on the weight of the paste.
Claim 3
Dependent Claim
13 words
Paste according to claim 1 wherein the polar organic solvent is a glycol.
Claim 4
Dependent Claim
13 words
Paste according to claim 1 wherein the aliphatic hydrocarbon is a mineral oil.
Claim 5
Dependent Claim
29 words
Paste according to claim 1 which, when heated to remove the vehicle therefrom yields less than 2.5% by weight of organic residues based on the weight of the paste.
Claim 6
Dependent Claim
22 words
Paste according to claim 1 wherein the polar solvent and the aliphatic hydrocarbon each has a lower boiling point of >100° C.
Claim 7
Dependent Claim
23 words
Paste according to claim 1 wherein the vehicle contains 0.2 to 10 wt %, based on the total weight thereof, of an emulsifier.
Claim 8
Dependent Claim
12 words
Paste according to claim 6 wherein the emulsifier is a poly(oxyalkylene)alkyl ether.
Claim 9
Dependent Claim
19 words
Paste according to claim 1 wherein the vehicle includes a co-solvent in an amount of up to 20 vol%.
Claim 10
Dependent Claim
21 words
Paste according to claim 1 wherein the vehicle includes a thickening agent in an amount of up to 30 wt %.
Claim 11
Dependent Claim
19 words
Paste according to claim 1 for manufacturing multilayer capacitors in which the particulate material is a palladium/silver powder mixture.
Claim 12
Dependent Claim
18 words
Paste according to claim 1 which is a solder paste in which the particulate material is solder powder.
Claim 13
Dependent Claim
25 words
Paste according to claim 11 wherein the solder powder is selected from the group consisting of an alloy of tin, lead, bismuth and combinations thereof.
References Cited (Backward Citations)
US4369063A
Cited
USRE32309E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |