Lead-free solder paste
First Claim
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1. A lead-free solder paste comprising:
- a solder powder; and
a flux medium including at least one colored dye material and at least one fluorescent dye material;
wherein upon melting the solder paste undergoes a color change from a colored state to a colorless metallic state and the melted solder paste fluoresces under black light.
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Abstract
A lead-free solder paste suitable for soldering components in electronic or microelectronic circuitry including a solder powder and a flux medium. The flux medium includes at least one colored dye material and at least one fluorescent dye material. The solder paste upon melting undergoes a color change from a colored state to a colorless metallic state and the melted solder paste fluoresces under black light.
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Citations
20 Claims
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1. A lead-free solder paste comprising:
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a solder powder; and
a flux medium including at least one colored dye material and at least one fluorescent dye material;
wherein upon melting the solder paste undergoes a color change from a colored state to a colorless metallic state and the melted solder paste fluoresces under black light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A lead-free solder paste comprising:
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about 80 to about 95 composition weight percent of a solder powder including at least two metallic components;
about 5 to about 20 composition weight percent of a flux medium including a rosin tackifying material, at least one organic acid, a rheological modifier, at least one colored dye material and at least one fluorescent dye material;
wherein upon melting the solder paste undergoes a color change from a colored state to a colorless metallic state and the melted solder paste fluoresces under black light. - View Dependent Claims (11, 12, 13, 14)
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15. A lead-free solder paste comprising:
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about 86 to about 91 composition weight percent of a solder powder including tin, silver and copper;
about 9 to about 14 composition weight percent of a flux medium, the flux medium including;
about 45 to about 50 weight percent hydrogenated rosin;
about 0.5 to about 15 composition weight percent organic acid;
about 2 to about 6 weight percent rheological modifier;
about 1 to about 15 weight percent surfactant;
about 0.2 to about 4 weight percent of at least one green dye material; and
about 0.01 to about 4 weight percent of at least one fluorescent dye material;
wherein upon melting the solder paste undergoes a color change from a colored state to a colorless metallic state and the melted solder paste fluoresces under black light. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification