1. Failing to pay the patent application fee and printing fee on schedule.
2. Failing to reply to the examiner's correction notice on schedule.
3. Failing to pay the first maintenance fee and late payment fee on schedule.
4. Failing to submit the substantive examination request on time and pay the substantive examination fee.
5. Failing to reply to the examiner's notice of examination opinions on schedule.
6. Failure to pay maintenance fees and late fees on schedule.
Legal basis: Article 35 of the Patent Law of People's Republic of China (PRC). Within three years from the date of filing, the administrative department for patent in the State Council may, upon the request of the applicant at any time, make a substantive examination of the application. If the applicant fails to request substantive examination within the time limit without justifiable reasons, the application shall be deemed to have been withdrawn. The patent administrative department of the State Council may, when it deems it necessary, examine the application for a patent for invention on its own.