US5183784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-glass pastes
Assignee: Johnson Matthey Inc
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Filing: 1991-09-17
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Granted: 1993-02-02
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Expires: 2011-09-17
Abstract
Abstract An improved silver-glass paste for bonding a semiconductive element to a substrate comprising a metal resinate. A surfactant containing lyophilic and lyophobic groups may also be included.
Inventors
- 👤 My N. Nguyen
- 👤 Chee-Kong Lee
- 👤 Thomas L. Herrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:22
CPC Classifications
C; C03; C03C; C03C8/00; C03C8/14; C03C8/18; H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H10; H10W; H10W70/00; H10W70/60; H10W70/62; H10W70/66; H10W70/666; H10W72/00; H10W72/071; H10W72/073; H10W72/07331; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352; H10W72/353; H10W72/354
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
32 words
In a silver-glass paste comprising silver flake, organic vehicle, organic resin, surfactant and a glass component, the improvement wherein the glass component comprises a mixture of lead phosphovanadate and lead telluride vanadate.
Claim 2
Dependent Claim
32 words
In a silver-glass paste comprising silver flake, organic vehicle, organic resin, surfactant and a glass component, the improvement wherein the glass component comprises a mixture of lead phosphovanadate and lead telluride vanadate.
Claim 3
Dependent Claim
22 words
The paste of claim 1 including 55-80% silver flake, 5-25% glass mixture, 0.0-2% resin and 0.05-2% surfactant, by weight of the paste.
Claim 4
Dependent Claim
31 words
The paste of claim 1 wherein the surface area of the silver flake ranges from 0.2 to 2 m 2 /g and the tap density ranges from 2.5 to 5.5 gram/cc.
Claim 5
Dependent Claim
27 words
The paste of claim 1 wherein the surface area of the silver flake is about 0.39 m 2 /g and the tap density is about 4.56 gram/cc.
Claim 6
Dependent Claim
20 words
The paste of claim 1 wherein the ratio of the two glasses are 5%-95% lead telluride vanadate 95%-5% lead phosphovandate.
Claim 7
Dependent Claim
30 words
The paste of claim 1 wherein the lead telluride vanadate glass comprises 31.8% PbO, 31.8% V 2 O 5 , 27.2% TeO 2 and 0.1% Bi 2 O 3 .
Claim 8
Dependent Claim
30 words
The paste of claim 1 wherein the organic vehicle is a mixture of solvents having a range of boiling points which broaden the range of solvent evolution from the paste.
Claim 9
Dependent Claim
14 words
The paste of claim 7 wherein the range of boiling points is 175°-245° C.
Claim 10
Dependent Claim
20 words
The paste of claim 7 wherein the mixture of solvents comprises 2,2,4 trimethylpentanediol-1,3 monoisobutyrate, ethylene glycol diacetate and trimethyl 3-cyclohexene-1-methanol.
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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) | 1996-02-02 | 1996-08-03 | 1997-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-02-02 | 2000-08-03 | 2001-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-02-02 | 2004-08-03 | 2005-02-02 | $7700.00 | Window Closed / Lapsed |