Ariosa Diagnostics this week filed a petition with the US Patent and Trademark Office for an inter partes review of a broad patent held by Sequenom in the field of prenatal diagnostics.

The patent in question, US Patent No. 6,258,540, which was issued to Dennis Lo of the Chinese University of Hong Kong and licensed by Sequenom, is also the subject of an ongoing lawsuit between Sequenom and Ariosa.

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