For International patents applications (PCT), there is strict time limit  with regard to national phase application in different designated countries.

You can find the time limit as outlined by WIPO here.

We specialize  in helping foreign intellectual property associates in entering national phase  applications  in the different jurisdictions and in particular to :

China
USA
Australia
New Zealand
Europe

Our international team of experts can help you:

• Filing of PCT application
• National phase application
• Prosecutions of patent applications
• Response to official actions
• Assignment
• Transfer and licensing of patents