When will Apple's patent on double-sided touch expire?

Just look at their authorization date. The invention patent is 20 years, and the utility model patent and appearance invention patent are both 10 years. Of course, because of the annual fee, if you don't pay it halfway, you will be disqualified!

But remind you, even if someone else's patent has expired, you can't apply, because this is already a well-known technology, just saying that you can use it!

I hope I can help you, welcome to ask and hope to adopt.