Is it useless for the first inventor to read a doctoral patent?

Useful. First of all, according to the relevant laws and regulations, there is no specific limit to the number of patent inventors, which can be one or more. Any inventor of a patent has made contributions to this patent, but different inventors have made different contributions. Therefore, the inventors of patents have the first inventor, the second inventor, the third inventor and so on. The greater the contribution, the higher the ranking.