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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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up vote 1 down vote accepted

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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could you please cite rule or article which states PCT application can be filed without claims?? – Pushpak Feb 9 '15 at 9:15
The questioner themselves have stated so in their question. – TTConsultants Feb 12 '15 at 10:50
in my understanding no PCT rule or article states that a application can be filed without claim. – Pushpak Feb 12 '15 at 10:55

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