Patent US3769007A successfully refreshed from Google Patents.
US3769007A
Expired / Lapsed
US
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Lead-bismuth alloy for soldering aluminum
Assignee: Alcoa Corp
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Filing: 1972-04-13
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Granted: 1973-10-30
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Expires: 1992-04-13
Abstract
Abstract An improved soldering alloy especially suitable for soldered joints comprising one or more aluminum members has a base containing lead and bismuth to which is added a small amount of silver or indium. The solder alloy has a low melting point of typically less than 480*F together with very good corrosion resistance. The alloy can also contain relatively small amounts of tin, zinc and antimony.
Inventors
- 👤 J Stokes
- 👤 R Cargnel
- 👤 R Geiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:19
CPC Classifications
C; C22; C22C; C22C11/00; C22C11/08; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/26; B23K35/268
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
25 words
The alloy according to claim 1 which additionally contains up to 10 percent tin, up to 2 percent zinc and up to 1.5 percent antimony.
Claim 2
Dependent Claim
13 words
The alloy according to claim 1 which contains less than 5 percent tin.
Claim 3
Dependent Claim
13 words
The alloy according to claim 1 which contains less than 0.5 percent tin.
Claim 4
Dependent Claim
13 words
The alloy according to claim 1 which contains 0.5 to 4.5 percent tin.
Claim 5
Dependent Claim
13 words
The alloy according to claim 1 which contains 0.1 to 2 percent zinc.
Claim 6
Dependent Claim
14 words
The alloy according to claim 1 which also contains 0.1 to 1.5 percent antimony.
Claim 7
Dependent Claim
13 words
The alloy according to claim 1 which contains at least 55 percent lead.
Claim 8
Dependent Claim
13 words
The alloy according to claim 1 which contains 55 to 83 percent lead.
Claim 9
Dependent Claim
13 words
The alloy according to claim 1 which contains at least 11 percent bismuth.
Claim 10
Dependent Claim
46 words
An alloy consisting essentially of 55 to 85 percent lead, 11 to 40 percent bismuth, the lead and bismuth totalling at least 80 percent, and at least one element selected from the group consisting of 0.5 to 5 percent silver and 0.5 to 10 percent indium.
Claim 11
Dependent Claim
18 words
The alloy according to claim 11 which contains tin but in an amount less than 5 percent tin.
Claim 12
Dependent Claim
13 words
The alloy according to claim 11 which contains less than 0.5 percent tin.
Claim 13
Dependent Claim
24 words
The alloy according to claim 2 which contains 55 to 65 percent lead, 20 to 30 percent bismuth and 5 to 10 percent tin.
Claim 14
Dependent Claim
26 words
The alloy according to claim 11 which consists essentially of 73 to 83 percent lead, 14 to 22 percent bismuth and 1.5 to 4 percent silver.
Claim 15
Dependent Claim
24 words
The alloy according to claim 14 wherein said silver range is 0.5 to 2 percent and said indium range is 0.75 to 3 percent.
Claim 16
Dependent Claim
13 words
The alloy according to claim 15 which contains less than 0.5 percent tin.
Claim 17
Dependent Claim
13 words
The alloy according to claim 15 which contains 0.5 to 4.5 percent tin.
References Cited (Backward Citations)
FR607661A
Cited
DE727651C
Cited
US2351477A
Cited
US2335615A
Cited
US2615074A
Cited
US2787346A
Cited
US3449818A
Cited
US3600164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |