First, the idea matters: 
 1, the seller to ensure that the registered trademark is the registered trademark owner of the real meaning of that seller to ensure file authenticity, legality and validity of the transfer of the registered trademark nature of the permanent transfer of ownership of the mark. 
 2, the registered trademark is a legally valid trademark. 
 3, the transfer of a trademark before the date of the transfer of licenses for use by third parties; the controversial transfer of the trademark does not exist prior to the transfer with a third party; trademark of the transfer before the transfer does not exist third-party property litigation preservation; 
 4, in accordance with the provisions of the Article, the same or similar trademarks registered by the Party should be in the same or similar goods together with the transfer to the B side. 
 5, since the date of the contract is signed, the seller promised not registered within the validity period, operate or permit others to operate with the transfer of trademarks identical or similar trademark, nor engaged in any commercial activities in competition with the trademark. 
 Second, the invalid transfer: 
 A trademark registration certificate is not valid. Invalidate the assignment 
 I 2 for sale by non-trademark holders. Invalidate the assignment 
 3 trademark registration of the same or similar trademarks registered in the same or similar goods is not transferred together. Invalidate the assignment 
 4 that may cause misidentification, confusion or other adverse effects on the transfer of registered trademarks. Invalidate the assignment 
 5 have not signed the transfer agreement. Invalidate the assignment 
 Trademark Office announcement is not approved the transfer of a registered trademark of the assignment was invalid.