Review Guide: "An invention that omits elements refers to an invention that omits one or more elements of a known product or method. If the invention is compared with the prior art, it omits one or more elements (for example, the product invention omits one or more parts; After omitting one or more steps, a method invention still maintains all the original functions or brings unexpected technical effects, which has outstanding substantive characteristics and remarkable progress. This invention is creative. "
If this improvement is really creative, Party B is not an infringement and can apply for a patent for its improved invention.
This is only theoretical, b be careful.