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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0941973 (1986-12-15) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 14 인용 특허 : 8 |
A well tool having a housing which includes a pressure reducing and fluid velocity reducing passageway. The passageway is formed by first and second vertically positioned members spaced from each other. The first member includes a tapered surface having plurality of grooves and ridges and the second
In a well tool having a housing and a pressure reducing and fluid velocity reducing passageway, the improvement comprising, said passageway formed by first and second vertically positioned members spaced from each other, said first member having a tapered surface including a plurality of grooves and
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