Some teaching AIDS want to apply for patents.

The purpose of applying for a patent is to occupy the market or authorize others to use it. If you think there is a market for the teaching of solution conductivity, you should still apply for a patent. You can apply for a patent directly from China National Intellectual Property Administration. If you haven't applied yet, you'd better ask the agent. You can consult your regular patent agency, and they should give you a clear opinion.