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| Number | Title | Issue Date |
| 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 |
| 6966857 | Sport ball with self-contained dual action inflation mechanism An inflatable sport ball, such as a basketball, a football, a soccer ball, a volleyball or a playground ball, is provided with a self-contained inflation mechanism, or multiple self-contained inflation mechanisms, for inflating or adding pressure to the ball. The me... | 11/22/2005 |
| 6773240 | Single piston dual chamber fuel pump A fuel pump for an automotive vehicle includes a housing having an opening extending therethrough, and a piston slidably supported within the opening. A pair of end caps are mounted to the housing, thereby encasing the piston within the opening. First and second pum... | 08/10/2004 |
| 6733257 | Dual cylinder apparatus for reciprocal hermetic compressor A dual cylinder apparatus for a reciprocal hermetic compressor with a cylinder body having two open ends. A pair of valve plate units are disposed at both ends of the cylinder body, and have refrigerant discharge holes formed therein. A pair of pistons are movably d... | 05/11/2004 |
| 6655935 | Gas compressor comprising a double acting piston, an elongate chamber, multiple inlets mounted within heads on both sides of the chamber, and one central outlet A gas compressor and method according to which a plurality of inlet valve assemblies are angularly spaced around a bore. A piston reciprocates in the bore to draw the fluid from the valve assemblies during movement of the piston unit in one direction and ... | 12/02/2003 |
| 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 |
| 6213725 | Compressor having an improved piston A compressor includes a housing having an upward extending tube coupled to a pressure gage. A piston is slidably received in the housing and has an annular groove for loosely receiving a sealing ring and has one or more notches communicating with the annu... | 04/10/2001 |
| 6158971 | Pump A pump which performs a pumping function by reciprocally moving a piston by driving a connecting rod so as to maintain a pump chamber in an airtight condition with a diaphragm sandwiched between a piston disposed on a side of a pump chamber and the connec... | 12/12/2000 |
| 6120265 | Two-stroke operable pump A pump includes a main body, an inner tube mounted in the main body, and a hollow piston slidably mounted in the main body and partially receiving the inner tube. A piston is mounted in the main body and slidable along the inner tube. Two O-rings are moun... | 09/19/2000 |
| 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 |
| 5702239 | Air pump with dual air intakes An air pump with dual air intakes includes a pump body having an enclosed end with a securing point at its inner side for retaining a diaphragm, and an open end connecting to a cover. The cover has a securing point at its inner side for retaining a diaphr... | 12/30/1997 |
| 5683234 | Hand pump apparatus having two pumping strokes and having an attachment member for engaging with different tire valves A hand pump includes a piston slidably engaged in a housing for separating the housing into two chambers. A tube is secured on top of the housing. The piston includes two annular grooves for receiving two sealing rings. A piston rod has one end secured to... | 11/04/1997 |
| 5681154 | Air pump with dual air intakes An air pump with dual air intakes includes a hollow pump body, a securing cover, a piston rod, a piston, an air outlet, a check valve, an air duct and a handle. The pump body has one end connected to the air outlet and the check valve. The peripheral rim ... | 10/28/1997 |
| 5538398 | Hand operated bicycle pump The disclosed manually operated bicycle pump is portable on the frame of a bicycle and need not be detached from the bicycle frame when in use. The disclosed pump transfers substantially the same volume of air to a pneumatic tube or tire on both inward an... | 07/23/1996 |
| 5531575 | Hand pump apparatus having two pumping strokes A hand pump includes a housing having two chambers communicated with each other. An attachment member is secured to the front portion of the housing. A piston is slidably engaged in one of the chambers and includes two annular grooves for receiving two se... | 07/02/1996 |
| 5489197 | Bidirectionally pumping air pump An improved pump structure including a shaft tube, a pivot tube, a piston element, a push and pull element and a handle element. The shaft tube is inserted inside the tube. The pivot tube's two ends are respectively connected to the handle element and the... | 02/06/1996 |
| 5449278 | Double action piston having plural annular check valves An air pump piston is provided peripherally with a first leakproof ring and a second leakproof ring, which are located respectively and contiguously at both ends of the piston. Located peripherally between the first and the second leakproof rings is a rad... | 09/12/1995 |
| 5443370 | Two cylinder manual air pump An air pump comprises a head; an air guiding tube fastened at one end thereof with the head and at another end thereof with a two-way air admitting piston; a first cylinder fitted over the two-way air admitting piston such that the first cylinder can be c... | 08/22/1995 |
| 5236008 | Sealing ring carrier and valve support A body having a longitudinal axis, and parallel bearing surfaces at opposite axial ends thereof, has grooves formed therein, adjacent both axial ends thereof for receiving sealing rings therein. The body is interposed between fluid-control valves which ar... | 08/17/1993 |
| 5131824 | Oldham compressor The present invention is a compressor using an Oldham-type assembly functioning as a piston to provide a compressing pump. An orbiting plate is eccentrically mounted on the crankshaft, and a compressing pump body is fixed within the interior of the housin... | 07/21/1992 |
| 5102052 | Fluid spray device A manually operable spray pump with a double-action pump and a detachable fluid reservoir. A pump cylinder has valves at each end to admit air into one of two pump chambers formed by a piston and means to simultaneously force air from the other chamber do... | 04/07/1992 |
| 5051073 | Bicycle pump A hand pump having a cylinder and piston in which the piston head is formed with an annular channel having an opening in the base of the annular channel in free communication with the interior of a hollow piston rod. A pair of radially-projecting stops ex... | 09/24/1991 |
| 5011383 | Valve assembly, for use in combination with a straight-cylinder, gas-compression chamber, and in combination therewith The assembly, designed for use in combination with a straight-cylinder, gas-compression chamber, has a center bolt which is threaded at opposite ends thereof to receive a pair of valve sets. Each of the latter has a ported valve seat, valve guard, and por... | 04/30/1991 |
| 4842489 | Hand-operated pump changeable from dual action to single action The invention provides a hand-operated pump for fluids in general, which comprises a body inside which a cylindrical hollow is provided, inside which a plunger is slidingly mounted, such a plunger dividing said hollow into a first variable-volume chamber ... | 06/27/1989 |
| 4830588 | Capillary primed pump A positive displacement pump useful under zero-gravity conditions is primed by the capillary wicking action of a fluid accumulator and a set of capillary plates located in a pair of pumping chambers. The fluid accumulator and capillary plates are closely ... | 05/16/1989 |
| 4823991 | Manually operated dual invertible pump A manually operated dispensing pump has dual pump mechanisms, one pump being operable in a normal upright position and the other pump being operable when the apparatus is inverted. The dual pumps are fed from the same storage vessel for the media to be pu... | 04/25/1989 |
| 4313716 | Articulated, energy converting structure An articulated marine structure for an offshore body of water which is subject to wave movement. The structure includes at least two floating elements which are pivotally joined along a common edge to permit relative movement between the respective elemen... | 02/02/1982 |
| 4286932 | Diaphragm pump A diaphragm pump including an eccentric circular cam or crank shaft, a connecting rod rotatably connected at one end to the eccentric circular cam or crank shaft, a pair of diaphragms each having one surface serving as pressure receiving surface, center d... | 09/01/1981 |
| 3981625 | Pump with gauge means A pump having a hollow cylinder, and a piston slidably received in the cylinder, with the piston dividing the inside of the cylinder into two chambers. A hollow piston rod has one end connected to the piston and the other end extending out of the cylinder... | 09/21/1976 |
