Appeal No. 96-2941
Application 07/903,353
1. A magnetic recording medium comprising a non-magnetic
support having provided thereon a lower magnetic layer [having a
thickness of 2.5 µm or higher] and an upper magnetic layer having
a thickness of 2 µm or lower [in this order], wherein both the
upper and lower magnetic layers contain [ferromagnetic] magnetic
particles and a binder, and the lower magnetic layer contains
carbon black having an average primary particle diameter of less
than 20 mµ in an amount of from 1.0 to 20 parts by weight per 100
parts by weight of the [ferromagnetic] magnetic particles present
in the lower magnetic layer, and the upper magnetic layer
contains carbon black having an average primary particle diameter
of at least 40 mµ but less than 80 mµ in an amount of from 0.1 to
10.0 parts by weight per 100 parts by weight of the
[ferromagnetic] magnetic particles present in the upper magnetic
layer[, but less than the amount of carbon black used in the
lower magnetic layer].
The examiner does not rely upon prior art in the rejection
of the appealed claims.
Appellants’ claimed invention in this Reissue application is
directed to a magnetic recording medium which finds utility as a
video tape. The claimed magnetic recording medium comprises a
non-magnetic support, a lower magnetic layer and an upper
magnetic layer having a thickness of 2 µm or lower. Both the
lower and upper magnetic layer contain carbon black, but the
carbon black in the lower layer has an average primary particle
diameter less than the average primary particle diameter of the
carbon black in the upper layer.
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Last modified: November 3, 2007