on the shelf vs prepatent

on the shelf

prep
  • Unmarried, typically through lack of interest from potential spouses. 

  • Injured. 

  • Laid aside, unused, abandoned. 

prepatent

adj
  • Prior to the existence of a legal patent. 

  • Before symptoms (especially of infection) become manifest. 

How often have the words on the shelf and prepatent occurred in a corpus of books? (source: Google Ngram Viewer )