according to article 49 of the trademark law, any unit or individual may apply to the trademark office for the cancellation of a registered trademark if it becomes the common name of the goods it has approved for use or if it has not been used for three consecutive years without justifiable reasons.

in our popular words, if the enterprise, as the right subject of registered trademarks, has closed down, the relevant registered trademarks may become "ownerless trademarks", which is what we now call "zombie trademarks".