There is a special system in the US patent system, which is the continuation application and continuation in part system. Through continuation cases, a patent family can often be created, and there can be an endless supply of offspring. As long as the applicant's patented technology still has market value, the system of continuation cases should be fully utilized to retain at least one case still in the application process. This way, there is still an opportunity to modify the claims (CA) and add new content. In this way, there is always a backstop, which greatly increases the difficulty for intending counterfeiters to break through patents.