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Searching the Ring Index Number Field

Searches the Ring Index field within a patent record. Enter one or more numbers connected with search operators.

Ring Index Numbers (RIN) are five-digit codes assigned to chemical ring systems. They are searchable in Derwent World Patent Index from 1972 onwards, for patents classified in:

  • Section B (Pharmaceuticals);
  • Section C (Agrochemicals); and/or
  • Section E (General Chemicals).

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Search Examples
  • 01829
  • 0182*
  • 018?9