Simply using the words that make up a trademark is not necessarily an infringement. If it is determined that the use of another's trademarked words may reasonably cause confusion regarding the trademarked product or service, then it is an infringement.

So, while I may trademark "McDonald's" for my chimney sweeping business, I will not be able to use the symbol of golden arches with it. However, even if my name is McDonald and I invent a great new hamburger, I may not call it "McDonald's."

__________________
DrTandem's San Diego Web Page Design, drtandem.com