You can trademark a catch phrase, provided that you use the catch phrase to brand your products or services.
For example, the catch phrase Just Do It is a registered trademark of Nike, Inc. In order to trademark a catch phrase you must prove that the phrase is distinctive and being used in commerce. If you can prove these two factors, you will be able to protect your phrase from imitation or recreation by registering it as a trademark.
Registering a catch phrase as a trademark can be a costly and time consuming process (more on trademark cost.) It is advisable to conduct a trademark search to ensure that it has not already been registered by another party.
