How best to protect your company slogan is a business decision.  

If nobody else in your market area in your field of work is using that slogan, you can claim it as a trademark.  If you print it on your cards, be sure to use the TM symbol beside it to show the public that you are claiming it as a trademark.

Although it is not necessary, you can register your trademark with your State's Secretary of State and apply for a Federal trademark.

You may find this video helpful:  Intellectual Property: The Difference Between Patents, Trademarks and Copyrights for Home Inspectors
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