Hi midnightgardener,

Yes you can sell a rose that you create by crossing one patent rose to another, and the patents do not pass onto the new rose even if one of the roses you use has a patent, it does not matter.

Patents on roses do NOT prohibit people from using them for breeding. Patents only prohibit people making copies of the patented variety by asexual means. You are free to cross any rose with any other rose, regardless of its patent status and you can do whatever you like with the seedlings you develop.