Patent US4933030A successfully refreshed from Google Patents.
US4933030A
Expired / Lapsed
US
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Low temperature glass composition, paste and method of use
Assignee: Individual
•
Filing: 1989-06-21
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Granted: 1990-06-12
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Expires: 2009-06-21
Abstract
Abstract A stable Tl 2 O 3 , V 2 O 5 , P 2 O 5 glass composition for a die attach paste requiring no resin and having a glassy edge temperature of below about 350° C.
Inventors
- 👤 Raymond L. Dietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:20
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/21; C03C8/00; C03C8/02; C03C8/08; C03C8/14; C03C8/18; H; H10; H10W; H10W72/00; H10W72/071; H10W72/073; H10W72/07331; H10W72/07336; H10W72/30; H10W72/321; H10W72/325; H10W72/351; H10W72/352; H10W72/353; H10W72/354; H10W90/00; H10W90/701; H10W90/731; H10W90/734
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
45 words
A glass composition having a glassy edge temperature of about 350° C. or less, and consisting essentially weight percent on an oxide basis: about 60-82.5% Tl 2 O 3 ; about 2.5-27.5% V 2 O 5 ; and about 2.5-17.5% P 2 O 5 .
Claim 2
Dependent Claim
45 words
A glass composition having a glassy edge temperature of about 350° C. or less, and consisting essentially weight percent on an oxide basis: about 60-82.5% Tl 2 O 3 ; about 2.5-27.5% V 2 O 5 ; and about 2.5-17.5% P 2 O 5 .
Claim 3
Dependent Claim
18 words
A glass composition according to claim 1 wherein said glassy edge temperature is about 300° C. or less.
Claim 4
Dependent Claim
18 words
A glass composition according to claim 1 wherein said glassy edge temperature is about 250° C. or less.
Claim 5
Dependent Claim
16 words
A glass composition according to claim 1 wherein said glassy edge temperature is about 200° C.
Claim 6
Dependent Claim
23 words
A glass composition according to claim 1, 2, 3 or 4 wherein said composition has substantially no devitrification edge below about 460° C.
Claim 7
Dependent Claim
39 words
A glass composition according to claim 1 consisting essentially of by weight percent on an oxide basis: about 69-74% Tl 2 O 3 ; about 16-22% V 2 O 5 ; and about 7-10% P 2 O 5 .
Claim 8
Dependent Claim
39 words
A glass composition according to claim 1 consisting essentially of by weight percent on an oxide basis: about 72% Tl 2 O 3 ; about 19% V 2 O 5 ; and about 9.0% P 2 O 5 .
Claim 9
Dependent Claim
21 words
A glass composition according to claim 6 or 7 wherein said composition has substantially no devitrification edge below about 460° C.
Claim 10
Dependent Claim
21 words
An essentially resin-free paste comprising the glass composition of claim 1, 2, 3, 4, 6 or 7 and an organic solvent.
Claim 11
Dependent Claim
26 words
A paste according to claim 9 wherein said solvent is selected from a terpene alcohol and mixtures thereof, and said paste further includes particles of silver.
Claim 12
Dependent Claim
74 words
A paste according to claim 10 wherein said solvent is a mixture of terpene alcohols selected from alpha, beta, and gamma terpineol, said paste consisting essentially of about 70-72% silver flake; about 16-20% glass; about 10-12% of said solvent and a surfactant; said glass consisting essentially of by weight on an oxide basis: about 72% Tl 2 O 3 ; about 19% V 2 O 5 and about 9% P 2 O 5 .
Claim 13
Dependent Claim
19 words
A paste according to claim 9 wherein said glass composition has substantially no devitrification edge below about 460° 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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |