Before filing for trademark, it is a good idea to search for information such as Trademark Acceptable Identification of Goods and Services, Trademark Manual of Examining Procedure, Design Code for the logos and images. With these guidelines, you can make certain the trademark you are developing is unique. It can also help you avoid any trouble or violations not only on the possible similarities on existing trademark, but on violation of standards that have been set.
When you file for a trademark with the United States Patent and Trademark Office (USPTO), there are many considerations you have to make to ensure the uniqueness of your trademark. Conventional things to consider are the name, word or phrase, the logo, symbol, design or images used in your trademark, making sure they are distinct from any of the existing trademarks out there. The main concern of the USPTO is to look for possible copyright infringement that your application may incur and to find ways to reject your trademark. With this risk at hand, it is best to search for trademarks existing and under application. There are free methods available for you to search for trademarks.
The Patent and Trademark Depository Library (PTDL) keeps records of patent and trademark materials within the United States of America at your disposal. They are also tasked to disseminate information involving patents and trademarks. You can go to the depository to manually check for whatever details you may need regarding trademarks or patents.