Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7229260 | Oilless air motor assembly for hydraulic pumps An oilless air motor assembly and method useable for driving hydraulic pumps and the like. The air motor assembly comprises a slide valve that moved back and forth relative to a valve sleeve situated about the slide valve. A low friction or lubricious dry seal membe... | 06/12/2007 |
| 7197975 | Piston-cylinder unit Piston-cylinder unit including a working cylinder; a piston attached to a piston rod and installed with freedom of axial displacement in the working cylinder; and fastening elements, at least one of which is screwed into a threaded bore in the piston rod, where the ... | 04/03/2007 |
| 7152679 | Downhole tool for deforming an object A downhole tool comprises a body defining a fluid chamber, a fluid outlet for directing fluid outwardly of the chamber, and an arrangement for producing a rapid reduction in the volume of the chamber, such that fluid in the chamber is displaced rapidly through the o... | 12/26/2006 |
| 7147442 | Automatic oil pump, with a valved pumping piston and a valved driving piston unit An automatic oil pump includes a drive chamber, having a reciprocal driving device, and an oil chamber, having a sucking device, located on two sides of a main body. The reciprocal driving device has a piston unit having a valve chamber at its center and a balance v... | 12/12/2006 |
| 6929064 | Downhole pump There is disclosed an improved pump (5, 5′) particularly suitable for use in a method of “artificial lift” in an oil/gas well. Known pumps used in artificial lift methods suffer from a number of problems/disadvantages—e.g. low efficiency (hydraulic ef... | 08/16/2005 |
| 5634521 | Valve assembly for downhole hydraulically actuated pump In a new valve assembly, the coacting abutting surfaces are imperfect due to normal fabrication techniques, and leakage occurs across these surfaces, which allows the control valve assembly to operate for a limited time while the engine parts are new, but... | 06/03/1997 |
| 5592920 | Distributor-type fuel injection pump for internal combustion engines A distributor-type fuel injection pump of the radial-plunger type with two intersecting cylinder bores in the rotor part, in each of which two pump plungers arranged opposite one another and delimiting a common pump working space are guided. The pump plun... | 01/14/1997 |
| 5554011 | Medical fluid pump powered by a constant source of vacuum A vacuum powered pump includes a spring biased piston or diaphragm in a vacuum chamber coupled to a source of vacuum. When vacuum is applied to the vacuum chamber, the piston or diaphragm is moved in a first direction against the spring. A delayed action ... | 09/10/1996 |
| 5500113 | Reverse osmosis water system A reverse osmosis system includes a reverse osmosis module with a reverse osmosis membrane and having an inlet port coupled to a source of feed water under predetermined pressure via a feed water inlet conduit, a product water outlet port for filtered out... | 03/19/1996 |
| 5435130 | Vehicle catalyst exhaust system for an internal-combustion engine An internal-combustion engine is provided with an exhaust pipe and an exhaust gas catalyst which can be preheated by a burner. Fuel is fed to this burner from a fuel tank by way of a fuel pump. The pressure of approximately 3 bar existing in a first fuel ... | 07/25/1995 |
| 5358386 | Hermetic compressor A hermetic compressor includes a sealed casing which accommodates therein a compressing unit for compressing a refrigerant and a driving unit for driving the compressing unit. An induction pipe is provided in the sealed casing for introducing the refriger... | 10/25/1994 |
| 5353870 | Well purging and sampling pump The disclosed well purging and sampling pump has a hydraulically actuated rim driven cylindrical pumping piston assisted by an internal precharged gas return spring all mounted coaxially within a pump housing cylinder suitable for being lowered into and s... | 10/11/1994 |
| 5350282 | Pneumatic tin sucker A pneumatic tin sucker having a sucking nozzle connected with a connecting tube connected with a lower inlet chamber of a control tube, and a compressed air tank deposited in an upper chamber of the control tube, a piston rod deposited to extend in the in... | 09/27/1994 |
| 5173035 | Reciprocating pump In the preferred and illustrated embodiment of a reciprocating pump, a plunger for pumping a liquid, a piston for reciprocating the plunger and a selector valve for changing a pilot flow passage between a supply passage communicating a pressure chamber wi... | 12/22/1992 |
| 5050380 | Means for receiving and subsequently emptying hydraulic fluid from a hydraulic system A means for receiving and subsequently emptying hydraulic fluid from a hydraulic system is described. It comprises a working cylinder (1) and a supply conduit (8) disposed between a pump and the working cylinder for supplying hydraulic fluid at high press... | 09/24/1991 |
| 5050482 | Apparatus for driving piston by fluid pressure An apparatus for driving a piston by fluid pressure in which a piston (8) is reciprocated upward and downward by supplying and discharging pressure fluid to and from an actuation chamber (9) disposed in a cylinder (7) through a pilot valve (18) and a flui... | 09/24/1991 |
| 4993924 | Reciprocating pump In the preferred and illustrated embodiment of a reciprocating pump, a plunger for pumping a liquied, a piston for reciprocating the plunger and a selector valve for changing a pilot flow passage between a supply passage communicating a pressure chamber w... | 02/19/1991 |
| 4890653 | Distributor permitting distribution of doses of liquid and intended for use as a beverage distributor A beverage distributor, particularly for use in an aircraft and comprising a storage receptacle (1), a pump (11) provided with the dosing chamber (11b) and a moveable member (12), an actuator for the moveable member, a withdrawal conduit (13) connected to... | 01/02/1990 |
| 4745969 | In-casing hydraulic jack system A hydraulic jack system for operating well bottom pumping units via a sucker rod string and polish rod that comprises a jack unit that is designed for mounting by being suspended fully within a well casing with a seal being created between the periphery o... | 05/24/1988 |
| 4414808 | Hydraulic actuator for well pumps A hydraulic actuator and system for driving a subsurface reciprocating pump. The actuator is double acting and comprises a piston reciprocable in a cylinder on a guide tube, so that the maximum volume of the chamber below the piston is greater than that o... | 11/15/1983 |
| 4352644 | Air-hydraulic pump An air-hydraulic pump wherein an air-motor drives the pump. The air-motor includes a reciprocal piston which is driven in one direction by fluid under pressure and is returned by a spring. A control valve is utilized to control the action of fluid under p... | 10/05/1982 |
| 4297088 | Pump assembly comprising gas spring means A pressure actuated, rodless pump for pumping fluid preferably from a well through a tubing string comprises a chamber and a check valved movable piston which define a pump cavity, the chamber having a check valved outlet to the tubing string on the cavit... | 10/27/1981 |
| 4273516 | Pumps for fluids A pump assembly for an hydraulic braking system comprises a housing having an inlet for connection to a tank for liquid, an outlet for connection to an hydraulic accumulator, and a piston reciprocably mounted in a bore in the housing to draw liquid into a... | 06/16/1981 |
| 4261688 | Hydraulic pressure converters An hydraulic pressure converter comprises a differential piston which works in a stepped bore in a housing. A pressure space is defined in the housing at the end of a portion of the piston which is of smaller area so that reciprocation of the piston in th... | 04/14/1981 |
| 4233000 | Variable ratio intensifier An improved differential pressure hydraulic pressure convertor whose ratio of output pressure to input pressure may be easily varied comprising a valve housing, a pump housing having a cylindrical bore therethrough, a power cylinder including a differenti... | 11/11/1980 |
| 4229143 | Method of and apparatus for transporting fluid substances The present invention relates to a method and an apparatus for transporting in alternating suction and displacement strokes of fluid substances, e.g., water, slurry, etc., by quanta by means of the potential energy of a primary liquid column by interposin... | 10/21/1980 |
| 4214854 | Hydraulically actuated pump assembly having mechanically actuated valve means A downhole, hydraulically actuated pump assembly, having an engine reciprocatingly connected to a production pump. Power fluid is conducted downhole to the engine of the pump assembly, while production fluid and spent power fluid is conducted uphole to th... | 07/29/1980 |
| 4182599 | Volume-rate respirator system and method A respiration unit for supplying a preselected limited volume of breathing gas to a patient at limited positive pressures, and at a preselected limited flow rate is disclosed. The system includes an air delivery cylinder having a drive weight which is fre... | 01/08/1980 |
| 4157772 | Volume adjustable and easily disassembled fluid dispensing apparatus A liquor dispensing apparatus for automatically moving liquor from its bottle to a hand held nozzle to facilitate the preparation of drink, the dispensing apparatus including a pump which is simply constructed, relatively inexpensive and highly reliable. ... | 06/12/1979 |
| 4141215 | Windmill mechanism A windmill in which a propeller is directly fixed to the shaft of a rotary hydraulic pump mounted on a cylinder casing rotatably mounted about a vertical axis to the top of a tower. A piston in the cylinder is recicprocated by the hydraulic fluid expelled... | 02/27/1979 |
| 4125176 | Injection type lubricating apparatus Pump body has a cylindrical chamber within which a spool-shaped insert fits. The insert has a central cylindrical bore within which the injection plunger works and has an external annular groove communicating with the bore through a lubricant supply port ... | 11/14/1978 |
| 4118154 | Hydraulically actuated pump assembly A downhole, hydraulically actuated pump assembly, having an engine reciprocatingly connected to a production pump. Power fluid is conducted downhole to the engine of the pump assembly, while production fluid and spent power fluid is conducted uphole to th... | 10/03/1978 |
| 4110058 | Vacuum-operated liquid pump A vacuum-operated liquid pump includes a pumping member and a housing defining a pump chamber in which the pumping member moves along suction inlet and pressure discharge strokes. The pumping member divides the pumping chamber into a liquid space on one s... | 08/29/1978 |
| 4102609 | Valve control system for air powered vacuum pump A source of fluid, regulated as to pressure intensity before entry into a control valve assembly, drives a fluid biased piston motor. A mechanically actuated and fluid held valve in the control valve assembly controls pressurization of a pressure chamber ... | 07/25/1978 |
| 4013385 | Deep well pump system A deep well pump system incorporating a sub-surface pump unit and a surface power unit with a fluid column formed therebetween. The pump unit incorporates a counterbalance means that is specifically illustrated as a collapsible volume chamber operably eng... | 03/22/1977 |
| 3945768 | Fluid motor drives pump having an active inlet valve Apparatus is disclosed for actuating hydraulic motor control valves in a predetermined timed relationship relative to a pump inlet valve, wherein the pump is connected to and driven by the hydraulic motor, to improve the metering capabilities of the motor... | 03/23/1976 |
