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> I don't think that is correct.

It is. It's often called the "research exemption." You literally can only get into any kind of trouble when your intentions are commercial.

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As a general defense, the research exemption is only applicable where you can reasonably claim you are using a patented invention for research purposes. But if it looks like the reason you are infringing on the patent is that you want to use the patent, but don't want to pay for the rights, that is not going to work. Even if your intentions are not commercial, making or using a patented invention is still infringement. Like I said before, it is highly unlikely that someone would know about the infringement if it was just done for personal use, but that doesn't mean it isn't infringement.

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