Appeal 2007-2359
Application 90/006,951
Timsit
72. According to the face of the Timsit patent, the assignee is Alcan Int'l
Ltd., the same entity as the patent-owner requestor in this reexamination
proceeding.
73. Timsit describes an aluminum alloy composite sheet said to be useful
in brazing.
74. Timsit explains that aluminum components are commonly joined by
disposing an aluminum brazing alloy between the surfaces to be joined and
subjecting the assembly to a brazing temperature, i.e., a temperature at
which the brazing alloy melts while the components remain unmelted.
(Timsit at 1:7–13.)
75. Timsit explains further that when the assembly is cooled, the brazing
alloy forms a fillit or joint that bonds the components. (Timsit at 1:13–15.)
76. According to Timsit, the conventional brazing sheet is prepared by
cladding a core aluminum alloy sheet with a sheet of high-silicon aluminum
alloy that is relatively expensive to produce and difficult to process in scrap-
recovery operations. (Timsit at 1:22–31.)
77. Timsit provides a brazing sheet in which the core alloy and cladding
alloys may be highly variable. (Timsit at 1:53–2:30.)
78. The key, according to Timsit, is to coat the cladding with a mixture of
a brazing flux material and metal particles capable of forming in situ a
eutectic alloy with aluminum. (Timsit at 1:45–52.)
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