If these three innovations are relatively independent of each other and produce their own technological progress, they can apply for declaration in three times. Even if it is not independent of each other, but the improvement of the progressive relationship, you can apply for three pieces. Only when several improvement points work together can we achieve relatively independent technical effects.
For example, a round cup with a handle, a lid with a lid, and a small button on the lid. Among the three improvements, the cup handle is for the convenience of holding the cup, the cup cover is for heat preservation and dust prevention, and the small button is for the convenience of holding and putting the cup cover. The improvement of the cup handle, the cup cover and the small button on the cup cover are independent of each other, and the small button on the cup cover is based on the improvement of the cup cover. At this time, a cup handle should be used independently, and the lid and the small button on the lid can be used independently. In technical terms, it involves the problem of oneness.
If there is great progress in innovation, you can apply for an invention patent.