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If another party patents an invention which builds on my own, do they have to get a license from me before they can start manufacturing their product? For example, if I invented the 'chair', and later someone comes up with the novel idea of a 'chair with inbuilt drink holder', can they go ahead an manufacture the 'chair with inbuilt drink holder' without permission from me?

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If they use your patented invention, they need to obtain a license from you. If you want to use their improvement, you would need to obtain a license from them.

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