Patent technology of vapour compressiontype air conditioners in China

Searches the data of invention and utility model patents of four major components of vapour compressiontype air conditioners, i.e. compressor, condenser, evaporator and expansion valve applied and authorized in 2000 to 2006 year in China. Analyses the development level in this field in recent years in China, which reflects the scientific research level in different areas, units and fields.