US4070192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminium soldering composition
Assignee: Multicore Solders Ltd
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Filing: 1975-08-19
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Granted: 1978-01-24
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Expires: 1995-08-19
Abstract
Abstract There is described a composition for soft soldering aluminium or alloys thereof using a fluxed solder composition. The fluxed solder composition comprises a soldering flux suitable for use in soft soldering aluminium and its alloys and a soft solder alloy of lead, tin and silver and, optionally, up to 3% copper.
Inventors
- 👤 Gordon Francis Arbib
- 👤 Bernard Michael Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:47
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; B23K35/22; B23K35/24; B23K35/26; B23K35/262; B23K35/268; B23K35/0227; B23K35/0233; B23K35/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A fluxed solder composition for use in soft soldering aluminium or aluminium alloys, said composition comprising in association (a) a soft solder alloy having a melting point of less than 300° C, said alloy consisting essentially of at least 35% by weight of lead, not less than 10% by weight of tin, from 0 to 3% by weight of copper, and silver with the relative amounts of silver and tin in said alloy being such that said amounts of silver and tin are within the area above the curve AA' in FIG. 2 of the drawings, and (b) a flux suitable for use in aluminium soldering selected from organic fluxes and reaction fluxes.
Claim 2
Dependent Claim
113 words
A fluxed solder composition for use in soft soldering aluminium or aluminium alloys, said composition comprising in association (a) a soft solder alloy having a melting point of less than 300° C, said alloy consisting essentially of at least 35% by weight of lead, not less than 10% by weight of tin, from 0 to 3% by weight of copper, and silver with the relative amounts of silver and tin in said alloy being such that said amounts of silver and tin are within the area above the curve AA' in FIG. 2 of the drawings, and (b) a flux suitable for use in aluminium soldering selected from organic fluxes and reaction fluxes.
Claim 3
Dependent Claim
24 words
A fluxed solder composition as claimed in claim 1, wherein the fluxed solder composition is in the form of a flux cored solder member.
Claim 4
Dependent Claim
26 words
A fluxed solder composition as claimed in claim 1, comprising a mixture of the flux and a plurality of discrete particles of the soft solder alloy.
Claim 5
Dependent Claim
26 words
A fluxed solder composition as claimed in claim 3, wherein the composition of the mixture is such that the mixture is dimensionally stable at room temperature.
Claim 6
Dependent Claim
48 words
A fluxed solder composition as claimed in claim 1, wherein said organic flux comprises: a. an amine, and b. a member selected from the group consisting of fluoboric acid, salts of fluoboric acid, alkali metal halides, and ammonium halides; and said reaction flux comprises: a heavy metal chloride.
Claim 7
Dependent Claim
18 words
A fluxed solder composition as claimed in claim 5, wherein said organic flux further comprises a metal oxide.
Claim 8
Dependent Claim
58 words
A fluxed solder composition as claimed in claim 5, wherein said amine is diethylenetriamine, said salts of fluoboric acid are ammonium fluoborate and zinc fluoborate, said alkali metal halides are lithium chloride and sodium fluoride, said ammonium halide is ammonium chloride, and said heavy metal chloride is selected from the group consisting of stannous chloride and zinc chloride.
Claim 9
Dependent Claim
25 words
A fluxed solder composition as claimed in claim 6, wherein said metal oxide is selected from the group consisting of zinc oxide and cadmium oxide.
Claim 10
Dependent Claim
31 words
A fluxed solder composition as claimed in claim 5, wherein said reaction flux further comprises at least one member selected from the group consisting of alkali metal halides and ammonium halides.
Claim 11
Dependent Claim
27 words
A fluxed solder composition as claimed in claim 9, wherein said alkali metal halides are lithium chloride and sodium fluoride and said ammonium halide is ammonium chloride.
Claim 12
Dependent Claim
30 words
A fluxed solder composition as claimed in claim 5, wherein said reaction flux further comprises at least one member selected from the group consisting of reducing agents and wetting agents.
Claim 13
Dependent Claim
23 words
A fluxed solder composition as claimed in claim 11, wherein said reducing agent is hydrazine hydrochloride and said wetting agent is oleic acid.
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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) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |