1, it is the most critical to determine whether the other party's products overlap with your claim. If so, the other party will infringe;
2. Before you obtained the patent right, did the other party's products have been produced and sold in the current sales place? If there is, the other party will not infringe;
3. If the other party's infringement is confirmed, how much loss will it cause you? If your loss cannot be calculated, how much will the other party gain from manufacturing and selling infringing products? This is the basis of your claim.
4. Collect evidence of the other party's infringement, including products, sales scope and sales volume.
Because the other party usually claims that your patent is invalid after filing a lawsuit, you must check whether your patent is defective before filing a lawsuit.
Because patent litigation is very professional, you should ask a lawyer to help you with the lawsuit. In order to prevent the other party from continuing the infringement and causing you greater losses, you can ask the court to issue a "pre-litigation injunction". Finally, by the way, bring a patent lawsuit to the intermediate people's court where the infringer is located.