I think you took that from the abstract. The abstract, description, or title, of a patent do not determine what a parent covers or not! That is determined by

I think you took that from the abstract. The abstract, description, or title, of a patent do not determine what a parent covers or not! That is determined by the claims of a patent. The abstract/description/title play a relatively insignificant legal role, these do come in only in some indirect ways. Please take a look at the claims I have cited in this comment chain, and also read about the importance and relevance of the claims from the links I recommended. When reading a patent to understand what it covers or not, it's recommended to start with the independent claims. Hope this helps. :-)