Question
If I apply for a patent in just one European country, is there a way to later expand the patent over different countries? Can I use the priority date from the national patent for the application in other countries or a European patent?
Answers: 2 public & 1 private
If you believe you will file in other countries, a PCT application is your best option rather than filing in just one European country. Although it is more expensive than a national filing, a PCT application will grant protection in up to 148 countries. However, you will need to eventually file for specific country/region protection no later than 30 months after the earliest filing date of your initial application.
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