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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0308934 (1989-02-07) |
발명자 / 주소 |
|
인용정보 | 피인용 횟수 : 16 인용 특허 : 6 |
A control system for a pump includes a level sensor switch that is positioned along a production string in an oil well shaft. The level sensor switch is protected from damage by inner and outer housings. A control circuit responsive to the level sensor switch is also provided. The control circuit in
A control system for a pump adapted for pumping liquid from an oil well shaft through a production string comprising: a control circuit including timing means remotely located from said oil well shaft, said timing means maintaining operation of said pump for a predetermined period of time so as to p
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