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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0369530 (1989-06-21) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 7 인용 특허 : 5 |
A backwater escape valve for plumbing systems comprising a cylindrical body adapted to be coupled to a drainpipe system at the opening normally occupied by a sealing plug, and having a vertically disposed outflow opening covered with a hinged, spring-loaded cover which is adapted to be forced open w
A backwater escape valve, comprising: an elongate member having a first internal passage extending from end to end thereof; external threads at one end of said elongate member which are of the same pitch and diameter as external threads of a cleanout sealing plug; internal threads at the other end o
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