Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 3, 2023
Patent Application Number
16645841
Date Filed
June 28, 2018
Patent Citations
Patent Primary Examiner
A first ventilation duct line has a first portion having a first sectional area, a second portion having a second sectional area larger than the first sectional area, and a third portion having an inclined inner face connecting the first portion and the second portion to each other. Further, there is a second ventilation duct line having an opening portion positioned on an inner side of the first portion of the first ventilation duct line.
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