Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 17, 2009
Patent Application Number
11736311
Date Filed
April 17, 2007
Patent Primary Examiner
Patent abstract
An internally grooved heat transfer tube for a cross fin tube type heat exchanger of a refrigerating air-conditioning water supply apparatus using a high-pressure refrigerant, wherein an intra-tubular heat transfer rate is improved while maintaining a sufficient strength for pressure resistance.
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