Does the patent applied for in China constitute an infringement of China's patent if it is produced and sold by foreigners abroad?

It does not constitute infringement, because patents are regional, and your company's patents are only applied for and authorized in China, which means that they are only protected in China.

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Remedy A: Apply for this patent of PCT in that country, so that your patent will have priority.

But note: that country should be a member of PCT, and the date when your company applies for PCT is less than one year from the date of application in China (inventions and utility models, if they are appearance, are only six months).

I don't think it's possible. Your patents are all authorized. It must have been a year.

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Remedy B: Improve your patent and reapply for PCT in that country. This is a remedial measure taken by many companies.

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If they sell in China, they can sue them! Get the materials ready. In fact, it is recommended that both parties negotiate first, because litigation wastes manpower and material resources. Even if there is compensation in the end, it is estimated that it will not fill the pit of money and time you spent.