Patent US5415944A successfully refreshed from Google Patents.
US5415944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solder clad substrate
Assignee: Motorola Solutions Inc
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Filing: 1994-05-02
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Granted: 1995-05-16
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Expires: 2014-05-02
Abstract
Abstract A solder-clad printed circuit board (100) has solder particles of one alloy (120) arranged within a matrix of a second solder alloy (115). This arrangement forms a flat structure that is alloyed to the solder pads (105) on the substrate. The solder particles (120) have a predetermined melting temperature and are made from one or more of the following elements: tin, lead, bismuth, indium, copper, antimony, cadmium, arsenic, aluminum, gallium, gold, silver. The second solder alloy (115) is compositionally distinct from the solder particles, and has a melting temperature that is lower than the melting temperature of the solder particles. The solder particles may comprise about 88% by weight, and the second solder alloy may comprise about 12% by weight of the solder cladding.
Inventors
- 👤 Vahid Kazem-Goudarzi
- 👤 Edwin L. Bradley, III
- 👤 Kingshuk Banerji
- 👤 Henry F. Liebman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:40
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; B22; B22F; B22F1/00; B23K35/22; B23K35/24; B23K35/26; B23K35/262; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3485; H05K2201/00; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0215; H05K2201/0263; H05K2201/0272; H05K2203/00; H05K2203/04; H05K2203/043; H05K2203/05; H05K2203/0562; H05K2203/0568; H05K3/10; H05K3/12; H05K3/1216; H05K3/3452; H05K3/346; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097; Y10T428/12104; Y10T428/1216
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
A circuit carrying substrate, comprising: an electrically insulating substrate having solderable portions; and a soldering composition alloyed to the solderable portions, the soldering composition having first solder particles arranged within a matrix of a second solder material to form a solid mass, the soldering composition comprising: particles of a first solder material having a predetermined solidus temperature; a second solder material compositionally distinct from the first solder material and having a predetermined liquidus temperature that is less than the predetermined solidus temperature of the first solder material.
Claim 2
Dependent Claim
87 words
A circuit carrying substrate, comprising: an electrically insulating substrate having solderable portions; and a soldering composition alloyed to the solderable portions, the soldering composition having first solder particles arranged within a matrix of a second solder material to form a solid mass, the soldering composition comprising: particles of a first solder material having a predetermined solidus temperature; a second solder material compositionally distinct from the first solder material and having a predetermined liquidus temperature that is less than the predetermined solidus temperature of the first solder material.
Claim 3
Dependent Claim
27 words
The circuit carrying substrate of claim 1, wherein the first solder particles comprise about 88% by weight and the second solder material comprises about 12% by weight.
Claim 4
Dependent Claim
19 words
The circuit carrying substrate of claim 1, wherein soldering composition forms a substantially planar coating on the solderable portions.
Claim 5
Dependent Claim
19 words
The circuit carrying substrate of claim 1, wherein the second solder material is alloyed to the first solder particles.
Claim 6
Dependent Claim
123 words
A solder-clad printed circuit board, comprising: a printed circuit board having solderable portions; a soldering composition on the solderable portions, the soldering composition comprising: first solder particles comprising an alloy of 62% tin, 36% lead and 2% silver, and having a melting range of about 179°-181° C.; a second solder alloy comprising an alloy of 43% tin, 43% lead and 14% bismuth, and having a melting range of about 144°-163° C.; the soldering composition comprising about 88% by weight of the first solder particles and about 12% by weight of the second solder alloy; and the soldering composition having the first solder particles arranged within a matrix of the second solder alloy to form a substantially solid, planar coating on the solderable portions.
Claim 7
Dependent Claim
123 words
A solder-clad printed circuit board, comprising: a printed circuit board having solderable portions; a soldering composition on the solderable portions, the soldering composition comprising: first solder particles comprising an alloy of 62% tin, 36% lead and 2% silver, and having a melting range of about 179°-181° C.; a second solder alloy comprising an alloy of 43% tin, 43% lead and 14% bismuth, and having a melting range of about 144°-163° C.; the soldering composition comprising about 88% by weight of the first solder particles and about 12% by weight of the second solder alloy; and the soldering composition having the first solder particles arranged within a matrix of the second solder alloy to form a substantially solid, planar coating on the solderable portions.
Claim 8
Dependent Claim
20 words
The solder-clad printed circuit board of claim 5, wherein the second solder material is alloyed to the first solder particles.
Claim 9
Dependent Claim
81 words
A semiconductor substrate, comprising: a semiconductor substrate having solderable portions; a soldering composition alloyed to the solderable portions, the soldering composition comprising: first solder particles having a predetermined solidus temperature; and a second solder material having a predetermined liquidus temperature that is less than the predetermined solidus temperature of the first solder material; the soldering composition having the first solder particles arranged within a matrix of the second solder alloy to form a substantially solid, planar coating on the solderable portions.
Claim 10
Dependent Claim
81 words
A semiconductor substrate, comprising: a semiconductor substrate having solderable portions; a soldering composition alloyed to the solderable portions, the soldering composition comprising: first solder particles having a predetermined solidus temperature; and a second solder material having a predetermined liquidus temperature that is less than the predetermined solidus temperature of the first solder material; the soldering composition having the first solder particles arranged within a matrix of the second solder alloy to form a substantially solid, planar coating on the solderable portions.
Claim 11
Dependent Claim
18 words
The semiconductor substrate of claim 7, wherein the second solder material is alloyed to the first solder particles.
Claim 12
Dependent Claim
30 words
The semiconductor substrate of claim 7, wherein the soldering composition comprises about 88% by weight of the first solder particles and about 12% by weight of the second solder alloy.
References Cited (Backward Citations)
US4778733A
Cited
US4967950A
Cited
US5154341A
Cited
US5233504A
Cited
US5229070A
Cited
US5320272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-05-15 | 1998-11-14 | 1999-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-15 | 2002-11-14 | 2003-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-15 | 2006-11-14 | 2007-05-16 | $7700.00 | Window Closed / Lapsed |