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I read:

When an inventor or a company, who is a resident in India, desires to file a patent application first in a country other than India, it is necessary to obtain an FFL from the Indian Patent Office.

This makes me wonder: which countries require inventors to get a permission (e.g., a foreign filing license) to be allowed to file a patent in another country?

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  • My answer was from the google search ”foreign filing license requirements”. The third result.
    – George White ♦
    Commented Jan 4 at 21:18

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Many countries have some similar requirement. The WIPO lists 34 member states with some foreign filing rules.

Some require it if the inventing was done in their country, others have rules for residents/citizens regardless of where the inventing occurred. Some only limit filings that contain “state secrets”. The linked table at the WIPO has a summary.

The U.S. requires a foreign filing license if the inventing was done in the US. Most countries provide a default of a license upon filing locally. That is, unless you hear otherwise within a set time frame you have a license. To file first non-locally you need to explicitly request a license.

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