Appeal No. 1997-1266
Application 08/078,791
alternating magnetic field. This field is inductively
coupled, substantially by the battery, to sense coil 30, which
reflects the composition of the battery. Since many batteries
have a protective jacket made of steel, the large iron content
thereof dominates the electro-magnetic properties. The
invention saturates the steel jacket with a quasi-static
magnetic field which allows the magnetic induction for the
alternating magnetic field to be largely determined by the
interior of the battery.
The independent claim 1 is reproduced as follows:
1. Apparatus for determining the type of battery or
accumulator (10), the apparatus comprising at least one
excitation coil (20) coupled to energising [sic] means (21,
22, 23) for generating an alternating magnetic field and
thereby inducing an alternating current in said battery or
accumulator (10), means for placing the battery or accumulator
(10) in said alternating magnetic field and detection means
(30, 31, 32) for measuring induced current during the presence
of the battery or accumulator (10) in the alternating magnetic
filed, characterised [sic] in that the apparatus further
comprising means (41, 42; 24, 34) for establishing a quasi-
static magnetic field in the battery or accumulator (10)
during the measurement of the induced current, said quasi-
static magnetic field being applied for causing a substantial
saturation in at least a portion of ferromagnetic parts of the
battery or accumulator (10).
The Examiner relies on the following references:
DeLanty 2,346,830 Apr. 18, 1944
2
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