logo vs registered trademark

logo

noun
  • A visual symbol or emblem that acts as a trademark or a means of identification of a company or organization. 

  • An audio recording for the same purpose; a jingle. 

  • A single graphic which contains one or more separate elements. 

  • An ensign, a badge of office, rank, or power. 

registered trademark

noun
  • A trademark that has been officially registered with the government by its owner. Indicated by the symbol ®. 

How often have the words logo and registered trademark occurred in a corpus of books? (source: Google Ngram Viewer )