There are no laws and regulations that specifically specify the size of registered marks.

The following is somewhat relevant for your reference:

The State Administration for Industry and Commerce’s supervision of trademark printing Article 5 of the reply to the relevant question states: Paragraph 2 of Article 9 of the Trademark Law stipulates that the trademark registrant has the right to indicate "registered trademark" or the registered mark "has the right" should be understood to mean that it can be indicated or not. mark. Failure to indicate the words "registered trademark" or a registered mark does not affect the protection of the registered trademark. Any act of a printing enterprise that forges or manufactures without permission the trademark registrant's registered trademark logo without the registered mark is an infringement of the exclusive right to use a trademark as specified in Article 52 (3) of the Trademark Law.