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

The Patent Trial and Appeal Board determined that challenged claims of Yangtze Memory Technologies Company’s patent relating to a channel hole plug structure of three-dimensional memory devices and a method for forming the same aren’t unpatentable as obvious over prior art, in an inter partes review by Micron Technology Inc. The board determined that the challenged claims aren’t obvious over prior art that relates to three-dimensional NAND memory devices, such as vertical NAND strings, and describes four exemplary structures and modifications thereo.
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