Case: Patents/Obviousness (P.T.A.B.)

The Patent Trial and Appeal Board held that the challenged claims of Yangtze Memory Technologies Company Ltd.'s patent that relates to a channel hole plug structure of three-dimensional memory devices are unpatentable as obvious over prior art, in an inter partes review by Micron Technology Inc. The board determined that the challenged claims are obvious over prior art that relates to three-dimensional NAND memory devices, such as vertical NAND strings, and describes four exemplary structures and modifications thereof.
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