Are Patents Renewable or may the Term of Protection be Extended?

The term of protection under most modern patent laws is 20 years from the filing date of the application. However, in some countries, the term of protection may be renewed or extended for applications in certain fields, such as pharmaceuticals or foodstuffs, which need to undergo an administrative approval procedure before they can be put on the market and, therefore, the patent owner could not enjoy his right, in certain cases, for a considerable period of time after the grant of the patent.