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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0937156 (1978-08-28) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 5 인용 특허 : 1 |
An oil well subsurface pump comprising a housing having one end thereof adapted to be secured to the lowermost end of a sucker rod, or the like, and the opposite end thereof in open communication with the fluid reservoir in a well bore, a ball check valve carried by the housing, a ball stop member d
A subsurface well pump for disposition within a working barrel of a well bore and arranged for reciprocal movement therebetween, said pump comprising housing means having one end in communication with a well fluid reservoir, ball check valve means carried by the housing means for providing alternate
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