Appeal No. 2000-0558 Page 5
Application No. 08/912,585
Claim 2 is directed to a cartridge having an aluminum
base plate, a magnetic tape loaded in the cartridge, and a
feeding mechanism mounted on the base plate for feeding the
magnetic tape across a magnetic head, the improvement
comprising an electrically conductive film on each surface of
the aluminum base plate wherein the electrically conductive
film is formed by chromate treatment.
Hakanson discloses (column 1, lines 32-41)
an improved method of reducing electrostatic
charge buildup in cassettes which house magnetic
recording tape by the application of non-
volatile, electrically conductive, organic
coating compositions to surfaces of the
cassettes and the components of the cassette.
The coating composition is preferably applied to
all surfaces which do not directly contact the
magnetic recording tape during storage or
playback mode, although those surfaces may also
be coated.
It is the examiner's opinion that the admitted prior art
discloses that the claimed type of cartridge with a metallic
base plate is known and that it would have been obvious to a
person having ordinary skill in the art to provide the prior
art cassette with a conductive coating as taught by Hakanson
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