Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7258254 | Dispensing end cap An end cap is attached to a container body to form a liquid media package for dispensing liquid media. The end cap includes an aperture in fluid communication with the liquid media in the package. The end cap also includes at least one radial arm extending outwardly... | 08/21/2007 |
| 7252486 | Hand-operated inflator A hand-operated inflator with dual cylinder is provided. Once the cylinders are pulled out on two sides of the central block to form a line axially, and a clamp plate at mid point in between the two cylinders is turned to the transversal position to lock the cylinde... | 08/07/2007 |
| 7178592 | Closed loop multiphase underbalanced drilling process The present invention provides apparatus and methods for handling fluids returning from a well. The fluids are introduced into a separator and a separated gas stream is recovered or recycled. The gas stream may comprise more than one phase. The separated gas stream ... | 02/20/2007 |
| 7074020 | Sanitary pump and sanitary valve A sanitary pump and sanitary valve is provided employing a dual action piston for providing a constant pressure metering and delivery of fluids utilizing a drive shaft positively driven and controlled by a drive motor for sanitary applications. The sanitary pump may... | 07/11/2006 |
| 6945062 | Heat pump water heating system including a compressor having a variable clearance volume A heat pump water heater system includes a compressor that has a variable clearance volume that can be selectively controlled to control the mass flow rate of refrigerant from the compressor. Under higher ambient air temperature conditions, the variable volume is in... | 09/20/2005 |
| 6935850 | Axially aligned dual piston cylinder air pump with a common head portion A dual-direction pump includes two cylinders arranged on opposite sides of a head portion and an inlet return-flow prevention device and a leakproof device mounted between the cylinder and the head portion for avoiding leakage at the juncture between the cylinder an... | 08/30/2005 |
| 6910871 | Valve guide and spring retainer assemblies Valve guide and spring retainer assemblies are described for use in plunger pump housings that incorporate structural features for stress-relief. These pump housing structural features accommodate correspondingly-shaped valve guides and/or spring retainers that are ... | 06/28/2005 |
| 6874999 | Micropumps with passive check valves An exemplary device and method for microfluidic transport is disclosed as providing inter alia a passive check valve (100), a fluid inlet channel (210), a fluid outlet channel (220) and a pumping cavity (240). The fluid inlet channel (... | 04/05/2005 |
| 6641232 | Piston pump for brake system with piston pump A pump for a brake system in which the pump includes two pump pistons driven by a motor. Each pump piston feeds the brake fluid both during a retraction stroke and during an extension stroke, and a relatively uniform feed flow is thereby attainable by a f... | 11/04/2003 |
| 6607366 | Variable clearance system for reciprocating compressors An unloader system is provided for a reciprocating gas compressor. The system includes an unloader valve assembly including a valve member controlling flow between compressor cylinder and a clearance bottle. Opening and closing of the valve member is cont... | 08/19/2003 |
| 6499968 | Integral pump and control valve A pumping unit, particularly for water supply in remote areas of the world, comprising a pump, control valve and tipping bucket mechanism enclosed in a single housing. The pumping unit is double-acting and, does not demand the presence of a drive pipe. Th... | 12/31/2002 |
| 6497560 | High volume low pressure air pump A high-volume low pressure hand operated air pump comprised of a tube body with a plunger shaft inserted into one end thereof and a check valve at the other end thereof with a floating seal secured to the internal end of the plunger shaft comprised of a c... | 12/24/2002 |
| 6422832 | Air pump capable of inflating and deflating an inflatable object interchangeably An air pump is capable of inflating and deflating an inflatable object and is formed of a main body having a cylinder duct, an air outlet and an air inlet in communication with the cylinder duct. The air in the cylinder duct is let out via the air outlet.... | 07/23/2002 |
| 6318967 | Gas compression kit and method with interchangeable compression cylinders A gas compression apparatus and method according to which a compression cylinder is connected between two heads, and gas is introduced into at least one header and into the cylinder. A piston is reciprocated in the cylinder with a stroke corresponding to ... | 11/20/2001 |
| 6220833 | Elimination of inlet valve for ABS pump A reciprocating piston-type pump for a brake system, such as an antilock brake system, includes a housing having an inlet and an outlet connected by a bore containing one or more pistons driven by an eccentric shaft for pumping high pressure brake fluid t... | 04/24/2001 |
| 6164376 | Triple action pumping system and method The present invention relates to an apparatus and method for selectively lifting produced fluid, including produced hydrocarbons and a portion of produced water, to a ground surface and for multiplying a hydrostatic head of a column of the produced fluid ... | 12/26/2000 |
| 6126419 | Caustic pumping apparatus Valve heads for modifying a pump to handling corrosive liquids are made of the thermoplastic UHMW-PE machined into a generally rectangular block having longitudinally extending front, back, and opposite side faces and transversely extending top and bottom... | 10/03/2000 |
| 6079959 | Reciprocating pump Pumps of this invention comprise a pump housing having at least one pressurizing chamber disposed therein, and a pressurizing member is disposed within the pressurizing chamber. The pressurizing member has a body with a solid imperforate head at one end, ... | 06/27/2000 |
| 6077053 | Piston type gas compressor It is intended to provide a piston type gas compressor capable of replacing a seal ring of a piston with a new one while preventing incorporation of metallic particles into a processing gas. A gas suction port 9 and a gas discharge port 10 are formed in a... | 06/20/2000 |
| 6068448 | Pressure hydraulic pump having first and second synchronously driven reciprocating pistons with a pressure control structure A high pressure hydraulic pump apparatus constituting a two-stage pressurizing hydraulic booster combining a pair of plunger pumps. The first and second pumps are driven into a push-pull synchronous operation at the equal stroke with each other. The per-s... | 05/30/2000 |
| 6068764 | Reverse osmosis pump and shut off valve In one embodiment a reverse osmosis permeate pump with shut off valve and reverse osmosis system employs bypassed feed water from the reverse osmosis membrane to drive a water wheel and gear set to reciprocate a piston back and forth between two chambers ... | 05/30/2000 |
| 5848878 | Pump with improved manifold A fluid pump with an improved manifold including a pump housing; an inlet manifold flow connected to the pump housing, the inlet manifold including an inlet manifold body, having a first end, a second end and an inlet manifold flow opening between the end... | 12/15/1998 |
| 5833925 | Automatic chemistry analyzer with improved ion selective electrode assembly An ion selective electrode assembly is provided having a sample injection cup, a flow cell analyzer and multiple module pump for simultaneously pumping liquids between the sample injection cup and the flow cell analyzer using a single motor. One of the pu... | 11/10/1998 |
| 5649809 | Crankshaft and piston rod connection for a double diaphragm pump The invention relates to a double diaphragm pump having flexible diaphragms disposed in displacement spaces and connected and mechanically coupled to piston rods, the displacement spaces being communicated via check valves to a suction manifold on the one... | 07/22/1997 |
| 5622486 | Radially-valve compressor with adjustable clearance A radially-valved compressor wherein the fixed clearance of the compressor can be quickly and easily adjusted by adjusting the position of the suction and/or discharge valves in relation to their respective compression chambers. The valves are slidably po... | 04/22/1997 |
| 5403168 | Double acting pump having inlet and outlet poppet valves A double acting pump having inlet and outlet poppet valves clamped to the pump housing in proximity to an inlet manifold and an outlet manifold. The end portion of each cylinder in the double acting pump is provided with a sloped wall to prevent debris in... | 04/04/1995 |
| 5368454 | Quiet check valve This invention represents an improvement in a standard four ball reciprocating piston pump. Such pumps utilize a greatly enlarged seat to provide hydraulic cushioning of the check balls in order to greatly quiet operation. A seat width on the order of 6% ... | 11/29/1994 |
| 5364244 | Pump arrangement including flag type inlet valves with spherical seating New valves to allow or prevent material flow through a conduit are disclosed. Such valves comprise a valve seat having a longitudinal axis, defining a through opening and including a seating surface which defines a portion of the through opening. A valve ... | 11/15/1994 |
| 5217324 | Dynamic breakwater and pumping system A dynamic breakwater system pumps water from a body of water in response to wave action or underwater currents. A submerged stationary base is fixed to a solid subsurface. A breakwater protrudes upwardly through the surface of the water. Wheels support th... | 06/08/1993 |
| 5156537 | Multiphase fluid mass transfer pump A positive displacement piston pump that can pump multiphase fluids by separating the fluid into its different components inside the pump before pumping the fluids. A reciprocating piston mounted inside the pump barrel divides the barrel into two chambers... | 10/20/1992 |
| 5154586 | Multi-channel linear concentrate pump A concentrate supply assembly for a post-mix beverage dispenser includes a plurality of containers for concentrate with discharge openings through which concentrate may flow. A plurality of conduits are coupled to the discharge openings and are in fluid c... | 10/13/1992 |
| 5076769 | Double acting pump An improved double acting piston pump of the type having a shaft connected to the piston for reciprocating the piston wherein the shaft extends from the pump body. The improvement of the present invention is to reciprocate the shaft with an asymmetrical u... | 12/31/1991 |
| 4970861 | Geared rotary-to-linear motion converting system for bidirectional pump drive A system for converting the output of a constant speed motor to variable fluidic flow at the ends of a linear actuator comprising a drive gear coupled with an electric motor for concurrent rotation at a fixed rotational speed; a driven gear operatively co... | 11/20/1990 |
| 4960369 | Rotatably driven positive displacement pump A rotatably driven positive displacement pump including a tubular conduit with a barrel communicating therewith, the barrel having a plurality of pairs of spaced apart fluid inlet and fluid outlet ports, each port being controlled by a unidirectional valv... | 10/02/1990 |
| 4936753 | Diaphragm pump with interchangeable valves and manifolds A double diaphragm pump is disclosed. The pump utilizes duckbill and ball-type check valves interchangeably. The check valves are held in place by intake and exhaust manifolds that are convertable to single or dual inlet or outlet manifolds.... | 06/26/1990 |
| 4895494 | Interchangeable manifolds for diaphragm pumps A double acting diaphragm pump includes a flat valve construction which is reversible to provide valving for both the inlet and outlet to the pumping chamber. A modular manifold construction cooperates with the flap valve construction to facilitate ease o... | 01/23/1990 |
| 4838860 | Infusion pump An infusion pump for administering fluid from a fluid source to a patient comprises a base member having an electric motor for driving a fluid pump housed within a cassette detachably mountable on the base and connectable to the motor. The cassette houses... | 06/13/1989 |
| 4824335 | Modular high pressure pump In a high pressure pump (1) for liquids or gases with a drive unit (2) and a pair of pump units (3) which are connected by a drive element (4) to a drive shaft driven by a motor (6), a considerable simplification in the sense of large scale production wit... | 04/25/1989 |
| 4661050 | High pressure gas transmission compressor A high pressure gas transmission compressor having valve chambers incorporating valves located in common valve pockets where the center lines of the valve chambers are non-intersecting with the compressor cylinder. In a first embodiment, the valve housing... | 04/28/1987 |
| 4615259 | Reciprocating gas compressor A Scotch yoke mechanism for actuating opposed-piston gas compressor is disclosed. The mechanism comprises a crank pin eccentrically extending from an end of a main drive shaft, a slider rotatably surrounding the crank pin, and a yoke defining a pair of op... | 10/07/1986 |
