You can apply for a patent in several European countries through a single application - an EP application. On the application form, you must indicate which countries you would like the patent to cover. If you obtain a patent in Europe and decide that the patent should cover Denmark, you need to submit a translation of the patent claims into Danish no later than 3 months after receiving the EP patent.
The Patent Coorporation Treaty (PCT) is an international patent system administered by the World Intellectual Property Organisation. The PCT system makes it possible to file a patent application in a single country and at the same time apply for a patent in several other countries. The patentability of the application is examined centrally.
After the PCT examination – and within 31 months from the date of the first filing - you must submit an application in each of the countries you wish to obtain a patent. This means that you can wait 31 months before deciding which countries you want to apply for a patent in.
Apply for an international patent