Appeal 2007-0001
Application 09/944,589
Appellant’s Specification also teaches that vehicle wheel assemblies
are placed under severe environment temperature changes and that the
temperature changes result in fine cracking of the magnetized encoder which
reduces the magnetic characteristics of the magnetized encoder and therefore
leads to inaccuracy (Specification 2:9-16).
The Norimatsu Declaration states that a person of ordinary skill in the
art would know to form the magnetized encoder of 85-90% wt% magnetic
material and 10-15% wt% elastic material without undue experimentation
based on the disclosure in Knack (Decl. ¶ 3).
Appellant’s Specification teaches that the magnetized encoder is
formed of heat resistant rubber and in a thermal endurance test condition in
which the magnetized encoder is subjected to 1,000 thermal cycles each
consisting of heating at 120oC for one hour followed by cooling at -40oC for
one hour, the magnetized encoder retains the following initial magnetic
characteristics when measured at a point 2.0 mm distant from a magnetic
sensor:
Single pitch deviation: ±2% or less and
Magnetic flux density: ±3 mT or higher [Specification 11:3-15.]
Alff discloses a wheel bearing assembly as claimed including a
magnetized encoder formed of elastomer material loaded with magnetic
particles (Alff, col. 2, ll. 26-36 (describing a sealing device with an
integrated coding device as described in U.S. Patent No. 5,431,413)). The
outer end of the cylindrical portion of the second sealing plate 25 has a wall
thickness smaller than the remaining part of the cylindrical portion and is
bent radially inward (Figs. 1 and 2).
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