Patent US2222747A successfully refreshed from Google Patents.
US5281561A
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US
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Low temperature sealing glass composition
Assignee: Individual
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Filing: 1993-02-09
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Granted: 1994-01-25
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Expires: 2013-02-09
Abstract
Abstract A low temperature sealing glass composition suitable for sealing integrated circuit alumina packages at temperatures below 400° C. in a short time of about ten minutes. This sealing glass composition is a mixture of a glass powder and 1 to 50% (by weight) of one or more low expansion ceramic powders. The glass powder comprises a lead borate or lead zinc borate glass and the joint addition of Cu 2 O, Tl 2 O and F in a range of 6.3 to 20% (by weight) wherein the molar ratio of Cu to Tl to F is in the range between 0.8 Cu: 0.8 Tl: 0.8 F to 1.2 Cu: 1.2 Tl: 1.2 F. The glass in powder form is blended with one or more compatible low expansion ceramic powders including cordierite, zircon, willemite, lead titanate or modified tin oxide.
Inventors
- 👤 Maurice E. Dumesnil
- 👤 Leo Finkelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:58
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/14; C03C3/142; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/074; C03C3/0745; C03C8/00; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
121 words
A low melting point glass composition consisting essentially of a homogeneous mixture of (in weight percent) ______________________________________
(a) PbO 60 to 80%
(b) B.sub.2 O.sub.3
5 to 12%
(c) Cu.sub.2 O 1 to 5%
(d) Tl.sub.2 O 5 to 15%
(e) F 0.3 to 1.5%
(f) ZnO 0 to 10%
(g) SiO.sub.2 0 to 3%
(h) Al.sub.2 O.sub.3
0 to 3%
______________________________________ and admixed with 1 to 50% (by weight) of a low expansion ceramic filler, wherein the combination of all Cu 2 O, Tl 2 O, and F equals 6.3 to 20%, and the molar ratio of Cu to Tl to F is in the range between 0.8 Cu: 0.8 Tl: 0.8 F to 1.2 Cu: 1.2 Tl: 1.2 F.
Claim 2
Dependent Claim
121 words
A low melting point glass composition consisting essentially of a homogeneous mixture of (in weight percent) ______________________________________
(a) PbO 60 to 80%
(b) B.sub.2 O.sub.3
5 to 12%
(c) Cu.sub.2 O 1 to 5%
(d) Tl.sub.2 O 5 to 15%
(e) F 0.3 to 1.5%
(f) ZnO 0 to 10%
(g) SiO.sub.2 0 to 3%
(h) Al.sub.2 O.sub.3
0 to 3%
______________________________________ and admixed with 1 to 50% (by weight) of a low expansion ceramic filler, wherein the combination of all Cu 2 O, Tl 2 O, and F equals 6.3 to 20%, and the molar ratio of Cu to Tl to F is in the range between 0.8 Cu: 0.8 Tl: 0.8 F to 1.2 Cu: 1.2 Tl: 1.2 F.
Claim 3
Dependent Claim
107 words
A low melting point glass composition consisting essentially of (in weight percent): ______________________________________
(a) PbO 65 to 75%
(b) B.sub.2 O.sub.3
6 to 10%
(c) Cu.sub.2 O 1.5 to 3%
(d) Tl.sub.2 O 8 to 12%
(e) F 0.5 to 1.2%
(f) ZnO 5 to 9%
(g) SiO.sub.2 1 to 2%
______________________________________ (h) Al 2 O 3 0.5 to 0.8% and admixed with 1 to 50% (by weight) of a low expansion ceramic filler, wherein the combination of all Cu2O, Tl 2 O, and F equals 10 to 16%; and the molar ratio of Cu to Tl to F is about 1 Cu: 1 Tl: 1 F.
Claim 4
Dependent Claim
107 words
A low melting point glass composition consisting essentially of (in weight percent): ______________________________________
(a) PbO 65 to 75%
(b) B.sub.2 O.sub.3
6 to 10%
(c) Cu.sub.2 O 1.5 to 3%
(d) Tl.sub.2 O 8 to 12%
(e) F 0.5 to 1.2%
(f) ZnO 5 to 9%
(g) SiO.sub.2 1 to 2%
______________________________________ (h) Al 2 O 3 0.5 to 0.8% and admixed with 1 to 50% (by weight) of a low expansion ceramic filler, wherein the combination of all Cu2O, Tl 2 O, and F equals 10 to 16%; and the molar ratio of Cu to Tl to F is about 1 Cu: 1 Tl: 1 F.
Claim 5
Dependent Claim
20 words
The glass composition of claim 1 wherein the filler is comprised of two or more different low expansion ceramic fillers.
Claim 6
Dependent Claim
20 words
The glass composition of claim 2 wherein the filler is comprised of two or more different low expansion ceramic fillers.
Claim 7
Dependent Claim
11 words
The glass composition of claim 1 wherein the filler is cordierite.
Claim 8
Dependent Claim
11 words
The glass composition of claim 2 wherein the filler is cordierite.
Claim 9
Dependent Claim
21 words
The glass composition of claim 3 wherein the fillers are a combination of cordierite and a secondary low expansion ceramic filler.
Claim 10
Dependent Claim
21 words
The glass composition of claim 4 wherein the fillers are a combination of cordierite and a secondary low expansion ceramic filler.
Claim 11
Dependent Claim
19 words
The glass composition of claim 7 wherein the secondary filler is modified tin oxide, lead titanate, zircon, or willemite.
Claim 12
Dependent Claim
19 words
The glass composition of claim 8 wherein the secondary filler is modified tin oxide, lead titanate, zircon, or willemite.
Claim 13
Dependent Claim
51 words
The glass composition of claim 1 further consisting essentially of up to 5% (by weight) of at least one additive selected form the group consisting of Bi 2 O 3 , TeO 2 , BaO, MgO, CaO, SrO, SnO 2 , Li 2 O, Na 2 O and K 2 O.
Claim 14
Dependent Claim
51 words
The glass composition of claim 2 further consisting essentially of up to 5% (by weight) of at least one additive selected from the group consisting of Bi 2 O 3 , TeO 2 , BaO, MgO, CaO, SrO, SnO 2 , Li 2 O, Na 2 O and K 2 O.
Claim 15
Dependent Claim
51 words
The glass composition of claim 3 further consisting essentially of up to 5% (by weight) of at least one additive selected from the group consisting of Bi 2 O 3 , TeO 2 , BaO, MgO, CaO, SrO, SnO 2 , Li 2 O, Na 2 O and K 2 O.
Claim 16
Dependent Claim
51 words
The glass composition of claim 4 further consisting essentially of up to 5% (by weight) of at least one additive selected from the group consisting of Bi 2 O 3 , TeO 2 , BaO, MgO, CaO, SrO, SnO 2 , Li 2 O, Na 2 O and K 2 O.
Claim 17
Dependent Claim
18 words
The glass composition of claim 3 wherein the fillers are a combination of cordierite and modified tin oxide.
Claim 18
Dependent Claim
18 words
The glass composition of claim 4 wherein the fillers are a combination of cordierite and modified tin oxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |