US4743302A
Expired / Lapsed
US
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Low melting glass composition
Assignee: VLSI PACKAGING MATERIALS Inc A CORP OF CA
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Filing: 1987-01-20
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Granted: 1988-05-10
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Expires: 2007-01-20
Abstract
Abstract Fluid, stable glasses that are useful for low temperature sealing applications are made by adding jointly bismuth oxide, zinc oxide, and phosphorus pentoxide to the lead oxide-vanadium oxide binary. The phosphorous pentoxide may be replaced partially or entirely with niobium pentoxide and/or tantalum pentoxide. Additives and fillers may be incorporated into the glass composition to enhance the fluidity or adhesive characteristics of the glass, alter its coefficient of linear thermal expansion or make it suitable for die attach application. Group V metal oxides, particularly niobium pentoxide, are preferred fillers for altering the coefficient of linear thermal expansion. Similarly these Group V metal oxides may also be added as particulate fillers to lead borate, lead borosilicate and zinc borate glasses. Silver metal is a preferred filler for making die attach compositions.
Inventors
- 👤 Maurice E. Dumesnil
- 👤 Leo Finkelstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:02
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/122; C03C3/16; C03C3/21; C03C8/00; C03C8/24; C03C8/245
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
101 words
A low melting glass composition comprising in weight percent calculated on an oxide basis: (a) PbO: 30% to 55%, (b) V 2 O 5 : 30% to 55%, (c) Bi 2 O 3 : 0.1% to 18%, (d) P 2 O 5 , Nb 2 O 5 , Ta 2 O 5 or combinations thereof: 0.1% to 10%, (e) ZnO, BaO, SrO, or combinations thereof: 0.1% to 10% wherein the combined weight percent of (c)+(d)+(e) is in the range of 0.3% and 20%, and with the proviso that (a) may be replaced partially up to 25% by weight with cesium oxide.
Claim 2
Dependent Claim
101 words
A low melting glass composition comprising in weight percent calculated on an oxide basis: (a) PbO: 30% to 55%, (b) V 2 O 5 : 30% to 55%, (c) Bi 2 O 3 : 0.1% to 18%, (d) P 2 O 5 , Nb 2 O 5 , Ta 2 O 5 or combinations thereof: 0.1% to 10%, (e) ZnO, BaO, SrO, or combinations thereof: 0.1% to 10% wherein the combined weight percent of (c)+(d)+(e) is in the range of 0.3% and 20%, and with the proviso that (a) may be replaced partially up to 25% by weight with cesium oxide.
Claim 3
Dependent Claim
58 words
The low melting glass of claim 1 wherein the composition includes at least one additive selected from the group consisting of: up to 3% by weight Cu 2 O up to 3% by weight Ag 2 O up to 3% by weight F up to 5% by weight MoO 3 up to 5% by weight WO 3 .
Claim 4
Dependent Claim
84 words
A low melting glass composition comprising in weight percent calculated on an oxide basis (a) PbO: 35% to 45% (b) V 2 O 5 : 35% to 45% (c) Bi 2 O 3 : 3% to 8% (d) ZnO: 2% to 7% (e) P 2 O 5 : 0% to 5% (f) Nb 2 O 5 : 0% to 5% (g) Ta 2 O 5 : 0% to 8% wherein the combined weight percent of (e)+(f)+(g) is in the range of 0.1 to 10%.
Claim 5
Dependent Claim
84 words
A low melting glass composition comprising in weight percent calculated on an oxide basis (a) PbO: 35% to 45% (b) V 2 O 5 : 35% to 45% (c) Bi 2 O 3 : 3% to 8% (d) ZnO: 2% to 7% (e) P 2 O 5 : 0% to 5% (f) Nb 2 O 5 : 0% to 5% (g) Ta 2 O 5 : 0% to 8% wherein the combined weight percent of (e)+(f)+(g) is in the range of 0.1 to 10%.
Claim 6
Dependent Claim
32 words
The glass of claim 1 mixed with about 1% to about 50% by weight, based on the mixture, of a low thermal expansion ceramic particulate filler that is compatible with the glass.
Claim 7
Dependent Claim
14 words
The glass of claim 4 wherein the filler is a Group V metal oxide.
Claim 8
Dependent Claim
17 words
The glass of claim 5 wherein the filler is a niobium-containing oxide, zirconium phosphate, or tantalum oxide.
Claim 9
Dependent Claim
11 words
The glass of claim 5 wherein the filler is niobium pentoxide.
Claim 10
Dependent Claim
32 words
The glass of claim 2 mixed with about 1% to about 50% by weight, based on the mixture, of a low thermal expansion ceramic particulate filler that is compatible with the glass.
Claim 11
Dependent Claim
14 words
The glass of claim 8 wherein the filler is a Group V metal oxide.
Claim 12
Dependent Claim
17 words
The glass of claim 9 wherein the filler is a niobium-containing oxide, zirconium phosphate, or tantalum oxide.
Claim 13
Dependent Claim
11 words
The glass of claim 9 wherein the filler is niobium pentoxide.
Claim 14
Dependent Claim
32 words
The glass of claim 3 mixed with about 1% to about 50% by weight, based on the mixture, of a low thermal expansion ceramic particulate filler that is compatible with the glass.
Claim 15
Dependent Claim
14 words
The glass of claim 12 wherein the filler is a Group V metal oxide.
Claim 16
Dependent Claim
19 words
The glass of claim 13 wherein the filler is a niobium-containing oxide, zirconium phosphate, aluminum phosphate, or tantalum oxide.
Claim 17
Dependent Claim
11 words
The glass of claim 13 wherein the filler is niobium pentoxide.
Claim 18
Dependent Claim
21 words
The glass of claim 1 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 19
Dependent Claim
21 words
The glass of claim 2 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 20
Dependent Claim
21 words
The glass of claim 3 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 21
Dependent Claim
21 words
The glass of claim 4 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 22
Dependent Claim
21 words
The glass of claim 5 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 23
Dependent Claim
21 words
The glass of claim 6 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 24
Dependent Claim
21 words
The glass of claim 7 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 25
Dependent Claim
21 words
The glass of claim 8 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 26
Dependent Claim
21 words
The glass of claim 9 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 27
Dependent Claim
21 words
The glass of claim 10 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 28
Dependent Claim
21 words
The glass of claim 11 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 29
Dependent Claim
21 words
The glass of claim 12 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 30
Dependent Claim
21 words
The glass of claim 13 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 31
Dependent Claim
21 words
The glass of claim 14 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 32
Dependent Claim
21 words
The glass of claim 15 mixed with up to 90% by weight, based on the mixture, of silver or gold powder.
Claim 33
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 1.
Claim 34
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 2.
Claim 35
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 3.
Claim 36
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 4.
Claim 37
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 5.
Claim 38
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 6.
Claim 39
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 7.
Claim 40
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 8.
Claim 41
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 9.
Claim 42
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 10.
Claim 43
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 11.
Claim 44
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 12.
Claim 45
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 13.
Claim 46
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 14.
Claim 47
Dependent Claim
29 words
An article of manufacture for use in sealing an electronic part comprising a metal, glass, or ceramic body coated with a pattern of the glass composition of claim 15.
Claim 48
Dependent Claim
98 words
A low melting glass composition consisting essentially of in weight percent calculated on an oxide basis: (a) PbO: 30% to 55%, (b) V 2 O 5 : 30% to 55%, (c) Bi 2 O 3 : 0.1% to 18%, (d) Nb 2 O 5 , Ta 2 O 5 or combinations thereof: 0.1% to 10% (e) ZnO, BaO, SrO, or combinations thereof: 0.1% to 10% wherein the combined weight percent of (c)+(d)+(e) is in the range of 0.3% and 20%, and with the proviso that (a) may be replaced partially up to 25% by weight with cesium oxide.
Claim 49
Dependent Claim
98 words
A low melting glass composition consisting essentially of in weight percent calculated on an oxide basis: (a) PbO: 30% to 55%, (b) V 2 O 5 : 30% to 55%, (c) Bi 2 O 3 : 0.1% to 18%, (d) Nb 2 O 5 , Ta 2 O 5 or combinations thereof: 0.1% to 10% (e) ZnO, BaO, SrO, or combinations thereof: 0.1% to 10% wherein the combined weight percent of (c)+(d)+(e) is in the range of 0.3% and 20%, and with the proviso that (a) may be replaced partially up to 25% by weight with cesium oxide.
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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) | 1991-05-10 | 1991-11-09 | 1992-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-10 | 1995-11-09 | 1996-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-10 | 1999-11-09 | 2000-05-10 | $7700.00 | Window Closed / Lapsed |