sentences:  For example, in the United Kingdom, it used to be required to obtain clearance for all inventions but now it is only prohibited for a UK resident to file an overseas patent application for inventions in certain sensitive technical areas without obtaining clearance through the United Kingdom Intellectual Property Office first.European patent applications cannot be validly filed at the EPO in Vienna, Austria.Within one month after the filing of an application, a filing fee and a search fee are due.