Appeal 2007-0501
Application 10/747,956
We find Seseke-Koyro ‘221 would have disclosed to one of ordinary
skill in this art a method for brazing aluminum and aluminum alloys at a
temperature range of 420ºC to 590ºC using a fluxing agent containing alkali
metal fluorozincates or mixtures of alkali metal fluoride and zinc fluoride as
the flux, wherein the alkali metal can be potassium and the alkali metal
fluorozincates providing better brazing (Seseke-Koyro ‘221, e.g., abstract
and col. 2, ll. 1-42). The fluxing agent can contain other fluxing agents as
well as auxiliary materials, such as, “[f]or example, . . . a mixture of alkali
[metal] fluorozincate and alkali fluoroaluminate, such as potassium
fluoroaluminate,” which “can be employed very well” (id., e.g., col. 2,
ll. 43-61, col. 3, ll. 5-27, and col. 4, l. 44, to col. 5, l. 35). “The fluxing agent
can be applied in a known manner” such as “[a] dry application based on
electrostatic spraying technology . . . because of the good fluidizing
properties of the fluxing agents,” and “in the form of aqueous or organic
suspensions or as a paste” (id., e.g., col. 3, l. 50, to col. 4, l. 28).
We find Seseke-Koyro ‘221 further discloses “[i]f, in addition to the
alkali fluorozincate and brazing metal or brazing metal precursor, alkali
fluoroaluminate is contained in the fluxing agent, the amounts preferably are
5 to 90 wt.-% of alkali fluorozincate, 5 to 90 wt.-% of solder or brazing
metal precursor and 5 to 90 wt.-% of alkali fluoroaluminate” (Seseke-Koyro
‘221, e.g., col. 4, l. 66, to col. 5, l. 4). A flux of potassium fluorozincate
prepared in Example 1, designated “JF 009400”, and Nocolok®, which is
potassium fluoroaluminate, is illustrated in a brazing test as
“JF 009400/ Nocolok®” in a “1:1 mixture” (e.g., col. 6, ll. 32-41, col. 8,
ll. 40-41, and cols. 9-10). In the brazing tests, the mixture of potassium
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