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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