1. Except that laws, regulations and administrative rules stipulate that all digits of the patent application number (including digits combined with check digits) must be written or printed continuously, a single-byte space of 1 can be used between the year number and the classification number of the patent application number and between the classification number and the serial number respectively.
2. Except for the characters, numbers, symbols or spaces specified in paragraphs 1 5. 1, 5.2 and 5.3, any other characters, numbers, symbols or spaces shall not be used as a part of the patent application number before and after the patent application number (including the case of being used in combination with check bits).