Federal Trademark Register Search      Our Federal Trademark Register Search includes a search of the U.S. Patent & Trademark Office database of active, expired and cancelled registrations, as well as pending applications, for marks identical or substantially similar to your proposed mark, providing a fairly good idea whether or not your proposed mark will be accepted for registration. However, the Federal trademark register does not include state and common law marks and, therefore, does not minimize the risk that your Federal trademark rights may be limited to the extent that state or common law rights in your mark already exist.