Challenged claims of Trina Solar Co. Ltd.'s patent that relates to solar cell technology are unpatentable as obvious over prior art, the Patent Trial and Appeal Board said, in an inter partes review by Runergy Alabama Inc., Runergy USA Inc., and Canadian Solar (USA) Inc. The board determined that all challenged claims are obvious over various combinations of prior art, including prior art that describes a solar cell, a solar cell and method of fabricating the same, and a solar cell comprising a semiconductor substrate on which a PN junction is formed.
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