If the product is re-developed and improved on the original basis,
and these improvements are novel and creative, you can apply for a patent based on this,< /p>
Not affected by original product patents.
However, if you need to use an improved product, you need to consider whether the improved product still falls within the scope of protection of the original patent claims
If so, there is a risk of infringement of the original patent rights by using the improved product.
As for what type of patent you want to apply for, you have to look specifically at where your product improvements are, and whether the innovation is high or low.
Generally speaking, invention patents have higher requirements on creativity than utility models.
If it is a subtle change in product structure, it is recommended to apply for a utility model.
If it is only a new design for the appearance of the product and does not involve changes in function or structure, you need to apply for a design.