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Fed. Circ. Affirms PTAB Ruling That Tool Patent Is Invalid

By Vin Gurrieri (March 25, 2015, 7:02 PM EDT) -- The Federal Circuit on Wednesday upheld a determination reached by the Patent Trial and Appeal Board in an inter partes re-examination that a cutting tool patent held by Kennametal Inc. was invalid both as anticipated and obvious in light of the prior art, saying the board's ruling was properly based on substantial evidence....

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