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| Number | Title | Issue Date |
| 7669516 | Cylinder-piston arrangement A sealing arrangement which is designed for a cylinder-piston arrangement of a reciprocating piston vacuum pump for sealing a gap between a cylinder wall and a piston displaceable in the cylinder, includes at least one L-shaped annular seal having one of its leg sec... | 03/02/2010 |
| 7444923 | Synthetic leather packings for reciprocating piston pump A packing stack for a reciprocating piston pump is formed of alternating V's of UHMWPE and either a polyurethane thermoplastic elastomer or an olefinic thermoplastic elastomer. ... | 11/04/2008 |
| 7354216 | Grease seal cup to retain lubrication for life extension in existing splined joint A grease seal cup for a splined joint between a drive shaft and a driven shaft comprises a cylindrical portion adapted to form a seal with the outer surface of the drive shaft and a seal with a sealing member, such as a spanner nut, of the driven shaft. The grease s... | 04/08/2008 |
| 7310965 | Compressor head, internal discriminator, external discriminator, manifold design for refrigeration recovery apparatus The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 12/25/2007 |
| 7290481 | Oscillating type compressor A lip ring is attached to a piston so as to be rotatable relative to the piston in a circumferential direction, and a seal portion is provided between a ring attachment groove of the piston and an attachment portion of the lip ring. During a suction stroke, the lip ... | 11/06/2007 |
| 7261153 | Packer cups A packer cup for use in sealing the interior of a pipe under pressure is described. The cup uses a bell-shaped end which has a lip of softer material which is integral with the body of the cup which is harder material. Under pressure the lip expands against the side... | 08/28/2007 |
| 7255207 | Piston seal and disc brake using the piston seal A piston seal of a disc brake can stabilize the amount of rollback of a piston by reducing thermal expansion and a decrease in modulus of elasticity of the piston seal caused by an increase in temperature, thereby preventing a driver from feeling that the brake oper... | 08/14/2007 |
| 7228788 | Piston structure for an air pump A piston for an air pump is disclosed. The piston has a piston rod having a connecting axle hole for positioning a bearing, which is protected with a bearing protection cap. The bearing is firmly secured within the axle hole. ... | 06/12/2007 |
| 7168361 | High pressure pump piston A high pressure piston for use within a liner for a reciprocating pump comprises an elastomeric seal and an annular bearing ring. During the pump's pressure stroke at least a portion of the bearing ring elastically expands radially to narrow or close the extrusion g... | 01/30/2007 |
| 7159412 | Compressor head, internal discriminator, external discriminator, manifold design for refrigeration recovery apparatus The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 01/09/2007 |
| 7131454 | Piston sealing mechanism for liquid additive injection pump A system for injecting a predetermined amount of a secondary fluid into a primary fluid stream uses a liquid additive injection pump driven by a fluid powered motor driven by the primary fluid stream. The liquid additive pump has a reciprocating piston movable withi... | 11/07/2006 |
| 7073346 | Compressor head, internal discriminator, external discriminator, manifold design for refrigerant recovery apparatus and vacuum sensor The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 07/11/2006 |
| 7011010 | Free piston device with time varying clearance seal A free piston device which is particularly applicable for use with a linear motor for providing acoustic energy to a cryocooler for generating refrigeration at cryogenic temperatures which comprises a time varying clearance seal to counteract piston drift. ... | 03/14/2006 |
| 6957605 | High pressure pump piston A high pressure piston for use within a liner for a reciprocating pump comprises an elastomeric seal and a metallic annular bearing ring having relatively high heat conductivity compared to the liner and seal. During the pump's pressure stroke a portion of the beari... | 10/25/2005 |
| 6928923 | Piston with supporting connector elements for a piston-cylinder arrangement, in particular a shock absorber piston A piston for a piston-cylinder arrangement, in particular a shock absorber piston exhibiting a piston body (6) provided with one peripheral web (12) protruding from the peripheral surface, disposed on said peripheral surface in both areas, each of whic... | 08/16/2005 |
| 6905315 | Valve plate in an air compressor An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump ... | 06/14/2005 |
| 6796217 | Injector assembly capable of preventing subsequent dripping, as well as plunger and seal member for the injector assembly A plunger for being inserted in a tubular barrel in an axially movable manner includes a plunger body having a distal end positioned within the barrel and a proximal end positioned outside of the barrel, and a seal member disposed on the distal end of the plunger bo... | 09/28/2004 |
| 6691607 | High and low temperature gas actuated cylinder A gas cylinder of the present invention comprises a housing having a tube, a front head and an rear end cap defining a chamber. A pair of ports are provided to allow for the input and exhaust of gas in the chamber. A piston is received in the chamber for ... | 02/17/2004 |
| 6602060 | Compressor employing piston-ring check valves A reciprocating compressor (26) includes two pistons (56 and 58) driven in opposite directions in a piston chamber (54). As a piston is driven in the downstream, compression-stroke direction, pressure causes a piston ring (64 or 66) that seals against the... | 08/05/2003 |
| 6354820 | Pump For the purpose of providing a thin pump designed to decrease the number of parts, the pump is provided with a rectangular parallelepiped cylinder (3) and a piston located inside of the cylinder, wherein the piston (4) reciprocates and oscillates in the c... | 03/12/2002 |
| 6349630 | Wobble piston and seal assembly for oil free compressor The present invention is directed to a wobble piston and seal assembly for an oil free compressor. An upwardly directed curvature is provided on a piston surface which supports the seal. The curvature is located adjacent the perimeter of the surface to im... | 02/26/2002 |
| 6279421 | Connecting rod assembly with reduced length variability A connecting rod assembly for rocking piston compressors, diaphragm compressors and vacuum pumps is provided where the overall height of the connecting rod assembly is dependent only upon the overall height of the connecting rod structure and is not depen... | 08/28/2001 |
| 6230605 | Piston-to-cylinder seal for a pneumatic engine Within a piston cylinder of a pneumatic engine, the system includes a piston proportioned for complemental travel within a piston cylinder, the piston having a radial compression surface and elements for effecting the axial reciprocation of the piston wit... | 05/15/2001 |
| 6213000 | Wobble piston and seal assembly for oil free compressor An improved wobble piston and seal assembly for an oil free air compressor. The piston has a seal support surface which is provided with an upwardly directed curve adjacent its perimeter. A flat annular seal is secured to the piston to be supported by the... | 04/10/2001 |
| 6085631 | Piston-to-cylinder seal for a pneumatic engine Within a piston cylinder of a pneumatic engine, the system includes a piston proportioned for complemental travel within a piston cylinder, the piston having a radial compression surface and elements for effecting the axial reciprocation of the piston wit... | 07/11/2000 |
| 6086339 | Solar-powered reciprocating pump A solar-powered reciprocating pump for submersible use in a well, such as a water well. The pump has a pumping section with a plunger therein. The pump also has a drive section with a rotating output shaft and a transmission section which converts the rot... | 07/11/2000 |
| 5996472 | Cryogenic reciprocating pump A novel reciprocating pump for cryogenic fluids. The pump has a cylinder sleeve, head, intake valve, discharge valve, and a reciprocating piston including a mechanical spring energized seal having a generally U-shaped jacket and a helical spring in the bi... | 12/07/1999 |
| 5974910 | Accumulator piston An accumulator piston for an automatic transmission. The piston comprises two components, the first and second being cup elements welded together with their closed ends in abutting relation. The lower cup includes a curled back portion with a radial flang... | 11/02/1999 |
| 5974943 | Variable stroke motor and valve A fluid valve system is provided for a variable stroke motor. The valve has a housing forming a cylinder, a first fluid input into the cylinder, a first fluid output out of the cylinder, a second fluid input into the cylinder, and a second fluid output ou... | 11/02/1999 |
| 5960700 | Replaceable mud pump piston seal A piston head assembly for reciprocating in a cylinder is disclosed, the cylinder having an inside surface and the inside surface having an inside diameter, comprising: a piston head including a central portion and a flange, the flange having a diameter t... | 10/05/1999 |
| 5937736 | Wobble piston with cooling fins extending through slots formed in the piston head An improved wobble piston for an air compressor. The piston has a head integrally connected to a connecting rod. The connecting rod has a free end for connection to a rotating eccentric. The piston has cooling fins to provide cooling as the piston is reci... | 08/17/1999 |
| 5884550 | Integral ring carbon-carbon piston An improved structure for a reciprocating internal combustion engine or compressor piston fabricated from carbon-carbon composite materials is disclosed. An integral ring carbon-carbon composite piston, disclosed herein, reduces the need for piston rings ... | 03/23/1999 |
| 5865442 | Lip-like seal A piston seal has formed on one side of the piston body upon which oil pressure works are a tapered surface portion which extends in a direction away from a piston sliding wall and a parallel surface portion. A lip-like seal is formed of a seal base porti... | 02/02/1999 |
| 5735188 | External slave cylinder for hydraulic clutch release system An external slave cylinder particularly suited for use in a hydraulic clutch release system for a motor vehicle. The cylinder includes a cylindrical body defining a bore, a piston slidably mounted in the bore, a seal positioned between the piston and the ... | 04/07/1998 |
| 5676380 | Venting piston ring A venting piston ring is provided with ports extending partly through the ring outer surface which cooperate with the end edge of a cylinder wall to vent the cylinder volume while intermediate surface lands between ports maintain ring to cylinder contact ... | 10/14/1997 |
| 5562186 | Piston seal A seal for use with an annular piston which may be used in a hydraulic system for actuating disc brakes or clutches of drivetrain subassemblies. The seal may be used with a piston having a relatively large average diameter and a relatively small radial th... | 10/08/1996 |
| 5540557 | Vacuum pump for containers A vacuum pump for removing air from containers includes a pump housing in the form of a conduit with an open end and a closed end. A piston in the form of a conduit, open at each end, is slidably mounted within the housing, and has an inside end within th... | 07/30/1996 |
| 5520092 | Piston of shock absorber A piston for a shock absorber as may be used in an automobile comprises a piston body, and a piston ring which covers the outer periphery thereof. One end of the piston ring is formed as a bend, which is received in a first receiving groove formed in the ... | 05/28/1996 |
| 5511464 | Cup-seal non-return valve In order to protect a cup-seal non-return valve (1) against permanent deformation, it is suggested to provide radial supporting walls (15) between the cylindrical inner wall (10)* (*translator's note: the correct reference numeral is `14`) and the sealing... | 04/30/1996 |
| 5492053 | Bonded piston and seal assembly A piston and seal assembly that has a rigid core with an elastomeric seal bonded thereto. The core has an annular outer cylindrical edge, a forwardly facing surface and a rearwardly facing surface. The elastomeric member is bonded to the core so as to enc... | 02/20/1996 |
