1, the other party sues you for infringement because your company's products infringe their patents, so what you need to do is to compare your products with the other party's patents, not with the other party's products. After the comparison, see if there are many differences. If you have a lawsuit, you will be sure.
2. Is the other party's patent stable? This requires a stability report. We can apply for this. If you make a report on maintaining stability, it will take two to three months, so the court session can be extended. If the final stability report is unstable, it is a patent evaluation report. After the patent office makes an assessment that it does not meet the conditions for granting a patent, the patent of the other party is invalid, and then you win.
You should also have your own patent. Take your patent to sue the other party, see where the other party and your rights are close, and check and balance each other. The final result may be mutual aggression and final reconciliation.
This incident also reminds us that we must do a good job in patent application in the product development stage.