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AFAIK, US provisional patent is valid for later use even without any claim, but I heard that some countries require patent having claims. So does PCT application accepts US provisional patent without claim as valid priority date?

Or should I file US provisional with claims (like a formal patent application)?

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Yes, definitely. The PCT accepts US provisional application without any claims. However, it is always advisable to write some broad claims in the Provisional application. It is just an added measure.

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