Class 417/553 - Annular

Subclass of Class 417 - Pumps
Definition: Apparatus in which the valve comprises a ring like member.
No. of patents: 76
Last issue date: 08/12/2008

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Number	Title	Issue Date
7410348	Multi-speed compressor/pump apparatus A pumping/compressing apparatus for use in a fluid handling system transferring a fluid from one location, e.g., a tank, to another location or to an end use is provided. The apparatus basically includes a motor and a multistage, e.g., two stage, device including at...	08/12/2008
7244108	Hermetic compressor with an improved cylinder head-suction muffler assembly This invention relates to a hermetic compressor used on a refrigerant cycle such as a refrigerator, and discloses a low noise compressor designed to attenuate a resonance sound in a compression chamber and intake pressure pulsing more operatively at a position adjac...	07/17/2007
7241120	Piston machine with ported piston head A piston machine includes a cylindrical wall (2) defining a swept volume (1) and having a plurality of gas inlet openings (5), and a piston (3) reciprocating in the swept volume (1), and the piston head (12) of which is form...	07/10/2007
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
7063521	Collapsible handgrip for inflator An inflator includes a hollow handgrip and an air cylinder having a shaft. One end of the shaft is connected with a piston in the cylinder and the other end of the shaft is provided with a stud extending out of the cylinder. A bottom wall and an opening are arranged...	06/20/2006
7063520	Suction valve assembly of reciprocating compressor In a reciprocating compressor including a piston slide-inserted into the compression space of the cylinder, having a gas path therein, inducing a fluid into the compression space through the gas path and varying a volume of the compression space while performing a l...	06/20/2006
7056106	Discharge valve apparatus for reciprocating compressor A discharge valve apparatus for a reciprocating compressor comprises a discharge cover having built-in volume so as to cover a front end surface of the cylinder; a discharge valve disposed so as to be contacted/separated to/from the front end surface of the cylinder...	06/06/2006
7025445	Gas actuated ink line valve Apparatus and methods are disclosed for preventing depriming of inkjet printheads in a printing system having a pressurized ink delivery system when the pressurizing gas is turned off. Normally-closed gas-actuated valves are disposed in the ink lines from the ink co...	04/11/2006
6953051	Valve plate structure Disclosed is a valve plate structure comprising: a suction valve for inhaling a low pressure of coolant through a linear reciprocating movement of a piston and an opening and closing operation in response to the back-and-forth movement; a valve plate coupled with th...	10/11/2005
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
6925832	High-low pressure dome type compressor Formed in a scroll type compression mechanism is a connection passageway with a discharge opening through which refrigerant compressed by the compression mechanism flows out into a clearance space defined between the compression mechanism and a drive motor. A muffle...	08/09/2005
6923348	Pump with pneumatic motor A pump having a compressed-air-operated reciprocating motor for reciprocating a pump plunger through forward and return strokes. The motor comprises a motor cylinder and a motor piston operable in the cylinder and itself acting as a valve for effecting its return th...	08/02/2005
6915846	Production tubing joint A production tubing joint is disclosed for a well comprising a barrel forming an upper tubing section and connected to the tubing hanger, a tubing connector within the barrel having a lower end connected to a lower tubing section of the production tubing string, a l...	07/12/2005
6863526	Lantern and fuel system A lantern and fuel system with a pump subassembly. The pump subassembly includes a beveled seat having an interior end with a cylindrical configuration constituting an interior guard with a first O-ring on the seat adjacent to the interior guard. The beveled seat ha...	03/08/2005
6832620	Apparatus for dosing lubricant into an air line An apparatus for dosing lubricant into a compressed air flow includes a lubricant container, a pneumatically operated lubricant pump, an injection channel, a non-return valve interposed between the outlet of the pump and the injection channel, and an electronic sens...	12/21/2004
6817060	Collapsible handle device for inflator A collapsible handle device for an inflator comprises an air cylinder having a shaft lever and a hollow grip, in which one end of the shaft lever is connected to a piston inside the air cylinder, and the other end is provided with a rotation body, which is pivotally...	11/16/2004
6739842	Pump A pump includes a base, a tubular portion formed on the base and with an upper end and a lower end, a pressure gauge communicated with the tubular portion near the upper end, a cylinder communicated with the tubular portion near the lower end, a piston movably recei...	05/25/2004
6514058	Compressor having an improved valved piston device A compressor includes a piston slidably received in a chamber of a housing and having an annular groove for receiving a sealing ring, and having one or more conduits and having a number of openings communicating with the annular groove of the piston. The ...	02/04/2003
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
6315534	Air compressor having easily assembled structure An air compressor includes a pressure gage attached to a cylinder housing, a compression device having a piston container slidably received in the cylinder housing for supporting a compression valve and a positioning block and a valve piece and a limiting...	11/13/2001
6280163	Spring blade intake valve for air compressor An air compressor includes a piston slidably received in a housing, and a sealing ring engaged between the piston and the housing. The piston includes an aperture for air to flow into the housing. A spring blade has one end secured to the piston and the o...	08/28/2001
6273690	Downhole pump with bypass around plunger The downhole pump has a barrel with a reciprocating plunger therein. The barrel has a first one-way valve, while the plunger has a second one-way valve. A barrel chamber is formed between the two one-way valves. The barrel chamber expands when the recipro...	08/14/2001
6241491	Device for supplying an apportioned minimum amount of fluid The invention relates to a pulse-triggered device for supplying an apportioned minimum amount of fluid, particularly oil for lubricating pneumatic systems. A valve actuated positive-displacement member may be moved using a pulse-triggered device located i...	06/05/2001
6120266	Piston mechanism with a flow passage through the piston A piston mechanism with a flow passage through the piston includes a cylinder which has a closable cylinder passage at one extremity thereof; a piston, axially movable in the cylinder, which has a closable piston flow passage and has in its outer circumfe...	09/19/2000
6099270	Single-piece piston for use in a pneumatically-activated pump A single-piece piston for use in a pneumatically-activated pump or other metering device to meter a predetermined amount of lubricant or other liquid. The piston is disposed within a chamber of the body of the metering device. The piston has a grooved end...	08/08/2000
6071097	Single-piece piston for use in a pneumatically-activated pump A single-piece piston for use in a pneumatically-activated pump to meter a predetermined amount of lubricant or other liquid. The piston has a grooved end that includes a head portion and a circumferentially-disposed angled channel for containing a sealin...	06/06/2000
6065947	Two-stroke operable pump A pump includes a main body, a piston slidably received in the main body, and a hose having a first end attached to an end of the main body and a second end attached to the piston. A handle is attached to a piston rod, which, in turn, is attached to the p...	05/23/2000
6017201	Air pump with a hidden extension tube An air pump is provided with an outer tube, a piston sealingly and slidably movable in the outer tube, an operating rod securely engaged with the piston and slidably received within the outer tube, a plug securely inserted into one end of the outer tube a...	01/25/2000
6017196	Bicycle inflator A bicycle inflator includes a cylinder having a cap fixedly received in a first end thereof and an end member fixedly received in a second end of the cylinder. The cap has a passage defined therethrough. The end member has a tubular portion extending down...	01/25/2000
5984652	Single-piece piston with central bore for use in a pneumatically-activated pump A single-piece piston for use in a pneumatically-activated pump to meter a predetermined amount of lubricant or other liquid. The piston has a grooved end that includes a head portion and a circumferentially-disposed angled channel for containing a sealin...	11/16/1999
5980222	Hermetic reciprocating compressor having a housing divided into a low pressure portion and a high pressure portion A compressor assembly includes a compressor mechanism mounted within a hermetically sealed housing. The housing is effectively divided into a low pressure area at a relatively low temperature and a high pressure area at a relatively high temperature. A mo...	11/09/1999
5924602	Air operated liquid pump An air operated liquid pump includes a pump with a reciprocating plunger driven by a piston contained in a cylinder. The plunger is connected to and reciprocates a dispensing piston that moves between two positions relative to the plunger to open and clos...	07/20/1999
5860798	Pump for pumping a fluid comprising a liquefied gas and apparatus having a pump The pump has a sleeve-like bearer. This contains a bush in which a piston is displaceable along an axis. The bearer inner surface and the bush outer surface are adjacent to one another in parts and are separated from one another in parts by an intermediat...	01/19/1999
5788463	Manual vacuum producing system having pressure indicator A vacuum system comprising a vacuum pump and a vacuum indicator. The vacuum pump comprises a cylinder, a piston disposed in the cylinder, a piston rod fixed to the piston and extending through an end of the cylinder, the rod being movable reciprocally, a ...	08/04/1998
5775886	Gas compressor with reciprocating piston with valve sheath A highly manufacturable gas compressor includes a sheath removably attached to a piston by several resilient fingers that snap into place at the bottom of the piston. The fingers act to limit relative motion between the piston and sheath as the piston is ...	07/07/1998
5775885	Combination suction manifold and cylinder block for a reciprocating compressor A hermetically sealed reciprocating refrigeration compressor has a suction gas arrangement including a suction gas plenum formed integral with a cylinder block for supplying suction gas directly to a cylinder so as to eliminate the need for external sucti...	07/07/1998
5662461	Dual piston pump with magnetically actuated pistons A hydraulic pump has a magnetic tube and two floating pistons within the tube, adapted to be moved in an axial direction within the tube as a result of magnetic flux generated by an electric coil surrounding the tube. Each piston has a valve for allowing ...	09/02/1997
5655890	Toy pump device A toy pump device includes a tube in which a piston rod is slidably received, a piston connected to an end of the piston rod, the piston having a tubular portion extending therefrom with a first slot defined therein and a seal slidably mounted to the tubu...	08/12/1997
5655887	Valved Piston arrangement for an electric motor driven air compressor An air compressor including a cylinder, a motor, a reciprocating mechanism coupled to the motor, a compression mechanism reciprocated in the cylinder by the reciprocating mechanism to compress air, the compression mechanism including a base having a coupl...	08/12/1997
5634780	Hand pump of a drinking device for pumping water to a diver A drinking device for a diver includes a water container and a hand pump for pumping water to the diver's mouth. The hand pump includes a piston rod slidably engaged in a housing and two discs secured to the piston rod for separating the housing into an u...	06/03/1997

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Class 417/553 - Annular