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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0647113 (1976-01-07) |
발명자 / 주소 |
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인용정보 | 피인용 횟수 : 30 인용 특허 : 0 |
A respirator filter is formed of felt impregnated with rosin, which is fractured throughout and is characterized by loosened fibers at one surface thereof. The method of forming the filter entails splitting a batt with fractured rosin impregnation to separate and displace the fibers at the plane of
In a filter for use at the intake opening of a respirator comprising a felted body of fibers impregnated with a rosin which is uniformly fractured, the improvement wherein said body is characterized by a surface at which the ends of fibers are loose and fluffed and extend outwardly from the body to
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