US5075262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-glass pastes
Assignee: Johnson Matthey Inc
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Filing: 1990-02-21
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Granted: 1991-12-24
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Expires: 2010-02-21
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
- 👤 Mark A. Blocker
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; H10W72/30; H10W72/071; H10W72/073; H10W72/07331; H10W72/321; H10W72/325; H10W72/351; H10W72/352; H10W72/353
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
In a silver-glass paste comprising flake, glass frit and organic vehicle, the improvement which comprises including in the paste, a metal resinate which does not dissolve in silver at the sintering temperature of the paste, the resinate being present in an amount sufficient to provide at least one of improved adhesion and reduced voids or cracks when the paste is used to bond a die to a ceramic substrate.
Claim 2
Dependent Claim
69 words
In a silver-glass paste comprising flake, glass frit and organic vehicle, the improvement which comprises including in the paste, a metal resinate which does not dissolve in silver at the sintering temperature of the paste, the resinate being present in an amount sufficient to provide at least one of improved adhesion and reduced voids or cracks when the paste is used to bond a die to a ceramic substrate.
Claim 3
Dependent Claim
9 words
The paste of claim 1 further comprising a surfactant.
Claim 4
Dependent Claim
25 words
The paste of claim 1 wherein the surface area of the silver flake is 0.4-1.5 m 2 /g and the tap density is 2.5-4.0 gram/cc.
Claim 5
Dependent Claim
21 words
The paste of claim 2 wherein the amount of metal resinate comprises about 0.01 to 5% by weight of the paste.
Claim 6
Dependent Claim
17 words
The paste of claim 4 wherein the amount of surfactant comprises 0.05-2% by weight of the paste.
Claim 7
Dependent Claim
18 words
The paste of claim 5 including 55-80% silver flake, 10-25% lead borate or phosphovanadate glass and 0.0-2% resin.
Claim 8
Dependent Claim
25 words
The paste of claim 1 wherein the metal resinate comprises the resinate selected from the group consisting of Pb, Mg, Ca, Ba, Rh, and Co.
Claim 9
Dependent Claim
13 words
The paste of claim 1 wherein the glass is lead phosphate vanadate glass.
Claim 10
Dependent Claim
24 words
A paste according to claim 1 wherein the vehicle is one which is solid at room temperature and melts at about above 70° C.
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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) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |