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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0552684 (1983-11-17) |
우선권정보 | ZA-0008620 (1982-11-23); ZA-0004553 (1983-06-22) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 23 인용 특허 : 0 |
A perforated cover assembly is made of two oppositely dished shell members releasably interconnected at their peripheries to define a space therebetween. The lower shell member has a plurality of outlet perforations spread over substantially its entire surface and each of which is raised relative to
A perforated cover assembly comprising two perforated shell members releasably held together at their peripheries to define a space therebetween and wherein one of the shell members is adapted to be uppermost in use, and the other is adapted to be lowermost in use, the operatively upper shell member
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