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Sumitomo/Valent sue Syngenta on clothianidin

Sumitomo Chemical and its US subsidiary, Valent USA Corporation (Walnut Creek, California), have filed three complaints against Syngenta in the US for alleged patent infringement over Sumitomo's neonicotinoid insecticide, clothianidin. The plaintiffs argue that Syngenta's sales of products containing clothianidin infringe Sumitomo's patent (No 5,034,404), while a later patent issued to Syngenta (No 7,105,469) should be declared invalid. Syngenta believes that the lawsuits are "without merit" and will "vigorously defend" its claims, the company told Agrow.


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