If the unpaid patent is terminated, the Patent Office will issue a notice of payment, informing the applicant to pay the annual fee and late payment fee. If the applicant still fails to pay or fails to pay the annual fee and late payment fee in full, the patent right will be terminated as of the expiration of the previous year.
Within two years after the termination of the patent right, the patentee may apply for restoration, during which you cannot apply. If the patentee does not apply for restoration for more than two years, he can apply for this patent.