Only the patent application number, no patent number. In other words, the patent is still under review! Can I use this patent at this time?

The technical scheme in the application can be used by anyone as long as they know it, because the technical scheme has not been granted a patent right at this time and is not legally binding.

In this way, there are two situations:

First, the technical scheme belongs to you, so before the scheme is granted the patent right, as long as it does not involve other prior legal patents, it can be produced and implemented, and the application number of the patent can be marked on the advertisement and packaging (note that although the application number becomes the patent number after authorization, it cannot be named as the patent number before the patent authorization announcement).

Second, the technical solution belongs to others. Although you can realize it before its patent authorization, when its patent authorization is granted, it will be bound by law. It is necessary to stop all infringing acts and destroy infringing products, which will cause the loss of production input.