1. Failing to pay the annual fee as required;
2. The patentee waives the patent right in writing;
3. The patent right expires and terminates.
Solution:
1. If a party delays the deadline due to irresistible reasons, resulting in the loss of rights, it may, within 2 months from the date when the obstacle is removed, at the latest within 2 years from the date when the deadline expires, explain the reasons to the Patent Office and attach relevant supporting documents to request the restoration of rights;
2. If a party delays the deadline for justifiable reasons, resulting in the loss of rights, he may explain the reasons to the Patent Office within 2 months from the date of receiving the notice from the Patent Office and request the restoration of rights;
3. If the maintenance fee or annual fee is not paid on schedule, you can only request the Patent Office to restore its rights for irresistible reasons. To go through the formalities of reinstatement, you must submit the petition for reinstatement with relevant certificates, and you must also pay the reinstatement fee;
4. If the patent right is abandoned in writing and terminated at the expiration of the time limit, there is no possibility of recovery.