What you are trying to do would fall under the Trademark category. A trademark protects words, names, symbols, sounds, or colors that distinguish goods and services from those manufactured or sold by others and to indicate the source of the goods. You would need to contact the Trademark Assistance Center:
The department you have contacted only handles patents.
What you are trying to do sounds like a copyright. A copyright protect works of authorship, such as writings, music, and works of art that have been tangibly expressed. The Library of Congress registers copyrights which last for the life of the author plus 70 years.