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Japan court says fish vaccine patent covers renamed bacterium but can't be enforced

By Toko Sekiguchi ( March 25, 2026, 08:53 GMT | Insight) -- A Tokyo court ruled that a fish vaccine patent held by Kyoritsu Seiyaku, a veterinary pharmaceutical company, extended to a product by its rival Biosiense using a bacterium later reclassified under a different species name, but still invalidated the patent as obvious and unsupported.A Tokyo court ruled that a fish vaccine patent held by Kyoritsu Seiyaku, a veterinary pharmaceutical company, extended to a product by its rival Biosiense using a bacterium later reclassified under a different species name, but still invalidated the patent as obvious and unsupported....

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