Canon Wins Patent-Infringement Lawsuit Against Korean Supplies Maker AlphaChem

Canon Inc. of Japan reports that on July 24th, the South Korean Supreme Court granted decisions favorable to Canon in Canon’s patent-infringement lawsuits against Korean makers of photosensitive-drums for use in Canon-made laser printers.

The Korean Supreme Court affirmed the Seoul High Court’s ruling of infringement in Canon’s patent-infringement lawsuit against AlphaChem, a Korean photosensitive drum maker, and the Korean Patent Court’s ruling that the claims of Canon’s Korean Patent No. 258,609 pertaining to photosensitive drums are valid. The Korean Supreme Court also affirmed the Seoul High Court’s decision that the ruling of the patent invalidation made by the Korean Trade Commission in the investigation against five Korean photosensitive drum makers should be revoked. The Korean Supreme Court’s decisions are final and cannot be appealed.

The ruling of patent infringement against AlphaChem is final and AlphaChem can no longer make or sell the infringing photosensitive drums.

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