Can the patent be manufactured and sold during the application process, and is the application number written on the product?

Or in other words, only the existence and stability of the patent right will be binding on the product or method described in its claim. Even if others claim to be applying for a patent that is essentially the same as your product, they can still produce and sell it, but the subsequent patent rights will be in trouble.

If you apply for a patent, as long as it doesn't touch other prior rights, then there is definitely no problem in production and sales. However, it should be noted that when the patent application number is marked on the product or its outer packaging, the words "patent application number" should be clearly marked to indicate that the right is being obtained, but it has not been formally obtained. When the application meets the authorization conditions and is authorized, it can be changed to "patent number"; When the application is rejected, the above application number and the words "patent application number and patent number" can no longer be marked on the product and its packaging.