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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0525579 (1974-11-20) |
우선권정보 | OE-0009972 (1973-11-28) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 13 인용 특허 : 0 |
A closure for a large diameter circular opening such as the end of a tubular conduit subjected to internal positive pressure comprises a coaxial cover lid that may be opened only when a pressure relieving venting valve is opened, the cover lid being connected over the opening by screw threaded means
In a closure arrangement for means defining a space adapted to contain fluid under pressure comprising a cylindrical chamber portion having an opening at one end surrounded by a rim member, a removably mounted cover member for said opening, said cover member being formed with external threads, means
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