The Eu Yan Sang (Hong Kong) director who resigned after a stormy annual general meeting last week has expressed concern over the company's ongoing trademark litigation. Charles Eu Keng-pang broke his silence yesterday, making a public announcement explaining his resignation. 'I was concerned that insufficient attention was being paid to the potentially serious problems facing Eu Yan Sang (Hong Kong) arising out of the pending trademark litigation and the quality-control problems relating to products containing moschus,' he said. He said the family controlled firm needed full-time professional management. On 27 May, the Chinese medicine manufacturer and distributor faced questions from minority shareholders on the trademark litigation. Eu Yan Sang is fighting a company owned by the adult children of one of its directors over the ownership of two trademarks.