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If I manufacture A+B+C, then I would be infringing upon A+B, no?

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A patent on an invention gives you no right to make it.

It is a common and persistent mis understanding. Patents convey the negative right to try to stop others from practicing your invention but rights to do anything.

There can be many reasons why you couldn’t make something you patented. It might be covered by others patents it could be illegal, etc.

For for specific question A B C should not have been granted if A B is known, let alone patented, as you can see from your two or three other questions.

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