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...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 7380608 | Pumping water from a natural gas well In a method for de-watering a gas well, the water is pumped by an inverted API pump acting as a reciprocating pump from a position in the well casing below the gas formation and the gas escapes through the well casing around the transport tubes. The reciprocating pu... | 06/03/2008 |
| 7314081 | Pumping from two levels of a pool of production fluid, and one way valve therefore A method of pumping upper production fluid from an upper level of an underground pool of production fluid and pumping lower production fluid having a higher concentration of sand from a lower level during a single pump cycle comprises providing a dual action recipro... | 01/01/2008 |
| 7044215 | Apparatus and method for driving submerged pumps I disclose an apparatus for driving a submerged pump in a well, of the kind where the pump has a driving rod. A motor is connected to a double-reduction helical gear drive, and the gear drive has a threaded output shaft. The gear drive output shaft is removably conn... | 05/16/2006 |
| 6558128 | Fluid well pumping system A fluid pumping system includes a number of stages. Each stage has a fluid chamber having a top end with an air aperture and a bottom end with a fluid apertures. An air line is connected to the air aperture, and a fluid input conduit, with an input check ... | 05/06/2003 |
| 6435838 | Fluid well pump A fluid pumping system includes a number of stages. Each stage has a fluid chamber having a top end with an air aperture and a bottom end with a fluid apertures. An air line is connected to the air aperture, and a fluid input conduit, with an input check ... | 08/20/2002 |
| 6004114 | Hydraulic submersible pump for oil well production A flow control assembly is provided for a submersible pump drive which has a hydraulic drive motor and a bearing pack for sealing a drive shaft which transfers drive from the drive motor to an oil well pump. The flow control assembly incorporates a produc... | 12/21/1999 |
| 5915475 | Down hole well pumping apparatus and method A method and apparatus for pumping formation liquids provides a reciprocating down hole pump on the end of a coiled tubing string. In one embodiment, one fluid flow path is provided through the inside of the coiled tubing and another flow path is provided... | 06/29/1999 |
| 5827051 | Regenerative hydraulic power transmission for down-hole pump Regenerative hydraulic power transmission for subsurface pumps, including a power source, a variable flow rate hydraulic pump, means to reverse flow through the hydraulic pump responsive to change in direction of the subsurface pump stroke, and an inertia... | 10/27/1998 |
| 5743716 | Reversible pump controller A reversible flow variable rate hydraulic swashplate pump furnishes hydraulic fluid to stroke a piston supporting a subsurface pump. The controller determines reversal of pump flow and timing and speed of upstroke and downstroke of the subsurface pump. No... | 04/28/1998 |
| 4534168 | Pump jack A pump jack having a walking beam oscillated in a vertical arc by a hydraulic actuating cylinder that receives pressurized hydraulic fluid from a variable displacement pump. The hydraulic actuating cylinder is controlled by a hydraulic valve having an ope... | 08/13/1985 |
| 4530645 | Oil well pumping apparatus The present system and apparatus for pumping an oil well damps out the stretch and over travel in sucker rod over travel particularly when the rod string approaches its point of reversal of direction either up or down. This is accomplished by decelerating... | 07/23/1985 |
| 4519293 | Oil well jack The invention relates to an oil well jack having a walking beam mounted on a frame for motion in a vertical plane; and a plurality of hydraulic actuators connected to move the walking beam. The amplitude of movement of the beam as well as the frequency of... | 05/28/1985 |
| 4474002 | Hydraulic drive pump apparatus A hydraulic drive apparatus for a wellhead pump jack which utilizes oppositely driven single-acting hydraulic cylinders as actuated by a variable volume pump having flow direction and flow volume controlled by a servo linkage and control lever. The linkag... | 10/02/1984 |
| 4449896 | Hydraulic operated surface pumping unit The hydraulic operated surface pumping unit of this invention is a counterbalanced cross beam type pumping unit driven by a hydraulic cylinder. The pumping unit can be operated in a first mode of equal upstroke and down stroke speeds or in a second mode o... | 05/22/1984 |
| 4438628 | Pump jack drive apparatus A pump jack drive apparatus includes a pair of hydraulic cylinders connected to a walking beam of the pump jack for reciprocating the horsehead, and a pair of microswitches or proximity switches which are closed by the walking beam at the limits of the st... | 03/27/1984 |
| 4347049 | Balance hydraulic pumping unit A balanced hydraulic well pumping unit for actuating an underground pump in which the weight of the downstroke is utilized to store energy in an accumulator which is then used to assist in the upward stroke of the pump. A working rod passes through first ... | 08/31/1982 |
| 4320799 | Oil well pump driving unit An oil well pumping apparatus which includes a submerged reciprocating pump mounted in a tubing arrangement communicating with the well head, a sucker rod string extending through the tubing arrangement and connected in driving relation with the pump, and... | 03/23/1982 |
| 4305461 | Well pumping apparatus A pumping apparatus that may be used with a well in which a sucker rod is connected with the well so as to remain in axial alignment with the same during shifting of the well and the sucker rod is supported clear of the well and the structure for operatin... | 12/15/1981 |
| 4299545 | Hydraulic oil well pumping apparatus An oil well pump which uses a pair of vertical hydraulic pistons to raise a cross beam. The polish rod is secured to the cross beam. At the top of the stroke automatic limit switches reverse the hydraulic fluid flow to allow the polish rod to descend and ... | 11/10/1981 |
| 4198820 | Pumping unit for a well pump A pumping unit for a well pump has a surface main cylinder with a main piston reciprocable therein, the piston having a connection to a standard well pump. In a flow cylinder of a relatively large diameter, a flow piston reciprocates within and divides th... | 04/22/1980 |
| 4191016 | Pumping jack A pumping jack for use with a well having a vertically reciprocable polish rod has a base including a horizontally extending table. A hydraulic cylinder is mounted on the base, with the cylinder axis extending parallel to and above the table. A plunger is... | 03/04/1980 |
| 4188787 | Hydraulic control apparatus Disclosed are methods and apparatus for controlling the flow of hydraulic fluid to and from a work cylinder. The disclosed system includes a reversible variable displacement pump interconnected between a work cylinder and a selector valve which may connec... | 02/19/1980 |
| 4167098 | Horizontal pumping unit A horizontally exposed pumping unit including a hollow base structure containing a volume of hydraulic fluid and compressed air, the base structure supporting a horizontally aligned reciprocating piston assembly deployed for horizontal translation along a... | 09/11/1979 |
| 4114375 | Pump jack device A pump jack, such as the type capable of use in pumping crude oil from an oil well, the pump jack including a double acting piston and cylinder motor with the piston rod of the motor being adapted to be connected to the polished rod projecting upwardly fr... | 09/19/1978 |
| 4099447 | Hydraulically operated oil well pump jack A hydraulically operated oil well pump jack utilizing a double acting hydraulically operated piston and cylinder assembly for pivoting the walking beam of an oil well pump jack, a linkage mechanism for operating a reversing valve to cause extension and re... | 07/11/1978 |
| 4047384 | Pump jack device A jack pump, such as the type capable of use in pumping crude oil from an oil well, the jack pump including a double acting piston and cylinder motor with the piston rod of the motor being adapted to be connected to the polished rod projecting upwardly fr... | 09/13/1977 |
| 3986355 | Well head gas counter balanced and operated actuator for oil well pumps A pumping device secured to a well head adapted to be counter balanced and operated by well head gas pressure. The pumping cylinder and the counter balance cylinder are positioned on a prolonged axis and employ a common polished piston rod operably mounte... | 10/19/1976 |
| 3939656 | Hydrostatic transmission pump An improved hydraulic drive system for a doubleacting hydraulic cylinder which drives or rocks the walking beam of an oil well pump. A closed circuit hydrostatic drive system is used to operate the double-acting hydraulic power cylinder unit and includes ... | 02/24/1976 |
| 3932990 | Closed loop booster system pneumatic actuator for oil wells An improved closed loop pneumatic system for driving a piston in a cylinder which employs a low pressure tank for receiving exhaust gases, a booster compressor transferring the gases to a high pressure tank which drives the piston on the up stroke. The co... | 01/20/1976 |
| 3933175 | Snifter valve useful in control means for a piston in a cylinder The device of this invention was developed for utilization in a pneumatic oil well pump actuator. The snifter valve performs a bleeder valve function in the control mechanism of a piston in a cylinder. The controls to which this invention is particularly ... | 01/20/1976 |
