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Yozmot's patent relates to customised ringtones for telephones sounded through a "boosted loudspeaker". HTC sued for revocation of the patent and Yozmot counterclaimed for infringement. The patent has 18 claims however by the time of trial, Yozmot contended that only four, namely claims 1, 5, 6 and 7, were independently valid. The court held all these claims invalid except for dependent claim 7, which was not alleged to be infringed. Yozmot also conditionally applied to amend the patent. The court therefore considered both the claims of the patent as granted and as proposed to be amended. It concluded however that claims 1, 5 and 6 as proposed to be amended were also invalid.

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