A trademark is any unique expression related to a product or service that distinguishes it from others. This expression could be a word, slogan, photograph, logo, graphic, colour combination, sound or even smell.
A trademark can be easily assigned from one authorized person to other. If a person wants to transfer his/her trademark or wants to shift the ownership of the trademark, then it can be done easily with a Trademark Assignment.
Trademarks can be transferred permanently or for a limited period of time. A proper agreement should be undersigned in such cases to avoid any further legal issues. You have authority to assign registered or unregistered trademark. You need to apply to the Registrar in such cases.