The registration of a trademark is valid only for a period of 10 years. After which, it can be renewed from time to time. Trademark renewal preserves those rights which are only available to a registered mark. In case the proprietor fails to renew the trademark, then he shall lose all the protection that comes along with registration. For example, a registered trademark has the benefit of the legal presumption of ownership. That means that the burden of proof is on others to try and disprove your ownership.