Clean energy patents had the fifth highest level on record in the first quarter of 2015, according to the Clean Energy Patent Growth Index, and as depicted below: 

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Solar patents again led Fuel Cell patents and all other technologies as the Solar sector patent count continues at very high levels.  Toyota managed to retain the quarterly Clean Energy Patent Crown from GM for yet another quarter.  The US led all countries in granted US clean energy patents. See the First Quarter report of the CEPGI for more.