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Precise definitions are a risk. Real words have nuance and interpretation. If you have a concisely worded formal definition you have little leeway to argue later and can give an infringer a blueprint for designing around your claims. Something less than a formal definition might be a better approach.


The definition of special terms belongs in your Written Description. Then your Claims (which aren’t required for a provisional patent by the way) will be interpreted in view of the definitions in the description, as long as those definitions are clear to a PHOSITA (“person having ordinary skill in the art”). If you litigate, there will be a claims ...

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