Appeal No. 1997-0377
Application 08/151,808
impurities, and which has a primary phase of austenite phase and martensite phase induced
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by working, and wherein the wire has 150 kgf/mm or more of tensile
strength at normal temperature and an average thermal expansion coefficient of
-6
6 x 10 /E C or less at from normal temperature to 230E C.
The references of record relied upon by the examiner are:
Decker et al. (Decker) 3,093,519 June 11, 1963
Yamada et al. (Yamada) 4,203,782 May 20, 1980
Enomoto 4-354848 Dec. 9, 1992
(Japanese Patent Application)
The appealed claims stand rejected under 35 U.S.C. § 103 as unpatentable over either
Decker or Enomoto combined with Yamada.
We do not sustain the examiner's stated rejections.
The subject matter on appeal is directed to an alloy wire of high-strength and low-
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thermal expansion. According to the claimed invention, the wire has 150 kgf/mm or more of
tensile strength at normal temperature and an average thermal expansion coefficient of
-6
6 x 10 /EC or less at from normal temperature to 230EC. Appellants' claimed alloy wire is
characterized as having desirable combination of properties which provides a significant
technical advance in wire products. As evident from appealed claim 20 reproduced above, the
claimed alloy wire is made of an alloy of specific chemical composition and micro structure.
In their brief at pages 5 and 6, appellants acknowledge that conventionally, steel wires
have been used for a core wire in power transmission lines which require high tensile strength
and torsional strength. Appellants admit that conventional steel wires
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