name brand vs registered trademark

name brand

noun
  • A product having such a mark or name 

  • A trademark, or a distinctive name for a brand, or for a range of products by a single manufacturer 

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 name brand and registered trademark occurred in a corpus of books? (source: Google Ngram Viewer )