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1.Is it necessary to register patent in China?
If your invention has potential in the Chinese market and you think that another company could make profits from your invention, you need protection from a patent. 
A patent gives you the right to exclude others from making your product. 
As a patent gives exclusivity, the patent holder has time to market the invention without competition making him/her able to charge higher prices. 
It gives the right to initiate legal action against anyone that is making or selling, without permission from the patent holder invention. 
You can make money by licensing or selling your invention to someone else.
It gives you priority over third parties wanting to register their patents in countries that do not require registration.

2.When is time to pay the annual fees for patent in China?
The annual fee of the year in which the patent right is granted shall be paid at registration. The subsequent annual fees shall be paid in advance within the month before the expiration of the preceding year.

3.How many types of patents exist in China?
There are three kinds of patents in China, it is composed of "patents for invention", "patents for utility model" and "patents for design".

4.What is the duration of Chinese Patent?
The duration of China Patent for invention is twenty years, the duration of patent for utility model and design is ten years, counted from the filing date in China.