| 摘要 |
PROBLEM TO BE SOLVED: To improve an invention of the prior application (Korean Patent Application No. 2005-73967) of this inventor concerning a dustproof mask where filters are inserted into the nasal cavities. SOLUTION: This invention provides the optimal dustproof mask by combining a technique of a patent document 3 which enlarges the surface areas of the filters to a dust protective mask of (Korean Patent Application No. 10-2005-0125179) of this inventor, combining a technique of a patent document 1 which combines the end of an clamping part through the middle part of the filters, and combining a technique of a patent document 2 and the pattern document 1 where the clamping part inserts and firmly holds the nasal septum. COPYRIGHT: (C)2008,JPO&INPIT
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