Main concept It is often clear who owns an invention, but disputes as to ownership most commonly arise in situations where employees make inventions, or where two or more people or organisations collaborate to make an invention. In the UK, the Patents Act 1977 (PA 1977) makes moderately detailed provision for how to determine who owns an invention. Check the register of patents Disputes might arise about invention ownership before or after a patent exists. If there is a patent, the register of patents in any country will state who is the registered owner of the patent in question. In the UK, GB patents can be searched on the UK Intellectual Property Office website. For European patents and those in many other countries, the epoline or espacenet databases can be searched online. The registered owner should be the correct owner, but this is not always the case, either because of a mistake or a misconception about ownership. Is there a contract? If there is doubt about who owns a particular invention, look at any contracts