Appeal No. 2002-0635
Application No. 09/534,583
32. An output choke for a D.C. arc welder having an
inductance comprising a high permeability core having
first and second pole pieces and an inductance
controlling air gap, said air gap defined by an end
surface on said first and second pole pieces, at least
a portion of said end surfaces of said first and second
pole pieces being spaced from one another and facing
one another, said end surfaces of said first and second
pole pieces each having corresponding outer edges and a
middle portion between said outer edges, at least a
portion of the middle portion of said corresponding end
surfaces being spaced apart at a varying distance to
gradually vary the inductance of said choke over a
current range, said middle portions having a
configuration to substantially prevent inflection
points along a saturation curve of said choke.
The following references are relied on by the examiner:
Cameron et al. (Cameron) 3,646,311 Feb. 29, 1972
Saitoh et al. (Saitoh) 5,204,653 Apr. 20, 1993
Hosozawa et al. (Hosozawa) 5,816,894 Oct. 06, 1998
Claims 32 through 35, 38 and 40 stand rejected under 35
U.S.C. § 102(e) as being anticipated by Hosozawa.
Dependent claims 37 and 52 through 55 stand rejected under
35 U.S.C. § 103 as being obvious over Hosozawa alone.
Claims 22 through 29 and 50 stand rejected under 35 U.S.C.
§ 103 over appellants’ admitted prior art shown at Fig. 2 in view
of Hosozawa, with the addition of Saitoh as to claims 30, 31, 43
and 44.
Claims 41, 42 and 56 stand rejected under 35 U.S.C. § 103 as
obvious over Hosozawa in view of Saitoh.
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