US3900151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joining process
Assignee: Vereinigte Aluminium Werke AG
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Filing: 1973-12-04
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Granted: 1975-08-19
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Expires: 1993-12-04
Abstract
Abstract A process for the fluxless soldering of aluminumcontaining workpieces in substantially non-oxidizing atmospheres is carried out with a solder which contains 2-26% by weight of Al and at least one additive from the group consisting of Bi, Sr, Ba, Sb and Be, the balance being Zn. The additives Bi, Sr, Ba and Sb constitute 0.01-10 percent by weight and the additive Be constitutes 0.00001-1.0 percent by weight of the solder. These additives lower the viscosity and surface tension of the molten solder and also decrease the interfacial tension between the molten solder and the workpieces.
Inventors
- 👤 Heinz Schoer
- 👤 Werner Schultze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:50
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/282
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
IN A PROCESS OF SOLDERING ALUMINUM-CONTAINING WORKS PIECES, THE STEP OF SOLDERING SAID WORKPIECES WITH A ZN BASE SOLDER COMPRISING 2-26% BY WEIGHT OF AL, AND BE, AS A WETTING AGENT, SAID BE LOWERING THE VISCOSITY AND SURFACE TENSION OF SAID SOLDIER IN IRS MOLTEN STATE AND SUBSTANTIALLY DECREASING THE INTERFACIAL TENSION BETWEEN THE MOLTEN SOLDIER AND SAID WORKPIECES, AND SAID STEP BEING PERFORMED WITHOUT A FLUX AND A SUBSTANTIALLY NON-OXIDIZUNG ATMOSPHERE
Claim 2
Dependent Claim
72 words
IN A PROCESS OF SOLDERING ALUMINUM-CONTAINING WORKS PIECES, THE STEP OF SOLDERING SAID WORKPIECES WITH A ZN BASE SOLDER COMPRISING 2-26% BY WEIGHT OF AL, AND BE, AS A WETTING AGENT, SAID BE LOWERING THE VISCOSITY AND SURFACE TENSION OF SAID SOLDIER IN IRS MOLTEN STATE AND SUBSTANTIALLY DECREASING THE INTERFACIAL TENSION BETWEEN THE MOLTEN SOLDIER AND SAID WORKPIECES, AND SAID STEP BEING PERFORMED WITHOUT A FLUX AND A SUBSTANTIALLY NON-OXIDIZUNG ATMOSPHERE
Claim 3
Dependent Claim
19 words
In a process as defined in claim 1, wherein said solder comprises 0.00001-1.0 percent by weight of said Be.
Claim 4
Dependent Claim
19 words
In a process as defined in claim 2, wherein said solder comprises 0.002-0.1 percent by weight of said Be.
Claim 5
Dependent Claim
65 words
In a process as defined in claim 1, wherein said solder further comprises at least one substance selected from the group consisting of Bi, Sr, Ba and Sb as an additional wetting agent, said Bi, Sr, Ba and Sb lowering the viscosity and surface tension of said solder in its molten state and substantially decreasing the interfacial tension between the molten solder and said workpieces.
Claim 6
Dependent Claim
19 words
In a process as defined in claim 4, wherein said solder comprises 0.01-10 percent by weight of said substance.
Claim 7
Dependent Claim
19 words
In a process as defined in claim 5, wherein said solder comprises 0.05-2 percent by weight of said substance.
Claim 8
Dependent Claim
19 words
In a process as defined in claim 4, wherein said solder comprises 0.00001-1.0 percent by weight of said Be.
Claim 9
Dependent Claim
19 words
In a process as defined in claim 7, wherein said solder comprises 0.002-0.1 percent by weight of said Be.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |