You can do this by filing a joint application with the assignee with the Trademark Office.
你们可以和受让人共同向商标局提出申请。
外贸英语话题王
The assignee should, of course, guarante the quality of the goods when he uses the registered trademark.
受让人应当保证使用注册商标的商品质量。
英语百科
Assignment (law)
（重定向自Assignee）
An assignment (Latin cessio) is a term used with similar meanings in the law of contracts and in the law of real estate. In both instances, it encompasses the transfer of rights held by one party—the assignor—to another party—the assignee. The details of the assignment determines some additional rights and liabilities (or duties).