1. Contact the applicant: You can contact the patent applicant to find out the reason and purpose of their patent application and try to negotiate with them. If it's because you didn't apply for a patent in time, others have the corresponding patent right first. You can try to negotiate with them and find a solution.
2. Objection: If you think that the patent you apply for involves rights and interests, you can raise an objection to the Patent Office and ask for revocation or modification of the patent. In this process, it is necessary to provide sufficient evidence to prove that patents infringe on rights and interests.
3. Seek legal help: If the above methods can't solve the problem, you can consider seeking legal help from the law, such as asking a lawyer to assist in handling related matters or seeking the help of the court to solve disputes.