| Patents for F02F 5 - Piston rings, e.g. associated with piston crown (2,184) |
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| 06/19/2008 | DE19911962B4 Kolbenring und eine Kombination von Verdichtungsringen Piston ring and a combination of compression rings |
| 06/18/2008 | CN201074558Y Novel composite oil ring |
| 06/18/2008 | CN201074557Y Composite oil ring |
| 06/05/2008 | WO2007115176A3 Methods and apparatus for operating an internal combustion engine |
| 06/04/2008 | CN101191556A Combined oil ring |
| 05/29/2008 | WO2008062863A1 Piston ring |
| 05/29/2008 | US20080122185 Combined oil ring |
| 05/28/2008 | EP1322794B1 Thermally applied coating for piston rings, consisting of mechanically alloyed powders |
| 05/28/2008 | CN201065795Y Piston ring |
| 05/28/2008 | CN201065787Y CG150 engine employing light optimization and dynamic balance technology |
| 05/22/2008 | WO2008059791A1 Chromium nitride coating film by ion plating, process for producing the same, and piston ring for internal combustion engine |
| 05/08/2008 | DE102007007962B3 Piston ring has base body with bearing surface, provided with compartmentation, which is provided with wear resistant coating, where partial physical vapor deposition covering layer is applied on bearing surface |
| 05/01/2008 | US20080100002 Cylinder apparatus |
| 04/30/2008 | CN201053344Y Natural gas engine |
| 04/24/2008 | WO2008047454A1 Reciprocating engine |
| 04/24/2008 | US20080095939 plurality of layers applied layer by layer to the peripheral surface by applying, using PVD, metal adhesive layer based on Cr to peripheral surface without adding nitrogen to process gas; Nitrogen is added while increasing the partial pressure forming a CrN gradient layer on the adhesive layer |
| 04/23/2008 | CN201050596Y Zirconium plating nitride piston ring |
| 04/23/2008 | CN201050417Y Piston and cylinder cooperation structure of motorcycle engine |
| 04/23/2008 | CN201050414Y Piston ring |
| 04/23/2008 | CN101166897A Reciprocating engine |
| 04/09/2008 | CN201045316Y Automobile engine piston energy-saving ring |
| 04/09/2008 | CN101158400A Oval-shaped cast iron piston ring processing technology |
| 04/09/2008 | CN100380023C Oil ring of internal combustion engine |
| 04/08/2008 | US7354045 Oil ring |
| 03/27/2008 | US20080076684 Includes a pair of sliding members having respective sliding surfaces slidable relative to each other and an ionic liquid applied to the respective sliding surfaces; liquids have very low negligible vapor pressures and show nonvolatility and thermal stability; electrochemically stable |
| 03/27/2008 | DE102006043303A1 Sliding layer manufactured by magnetron-sputtering procedure, useful for tribological system from piston and cylinder in combustion engine, comprises metal carbide particles deposited in a matrix from amorphous hydrogenous hard carbon |
| 03/26/2008 | EP1903229A2 Low-friction sliding mechanism and uses thereof |
| 03/26/2008 | EP1377766B1 Side rail and combined oil control ring incorporated with the side rails for reduction of oil consumption |
| 03/26/2008 | CN201041231Y Combined type piston ring with novel positioning device |
| 03/26/2008 | CN201041230Y Self-closed combined piston ring |
| 03/26/2008 | CN201041088Y Closed type piston ring |
| 03/26/2008 | CN201041076Y IC engine |
| 03/26/2008 | CN101149125A Low-friction sliding mechanism and uses thereof |
| 03/26/2008 | CN101149022A Air leak proof piston ring |
| 03/26/2008 | CN101149021A Low friction sliding mechanism |
| 03/19/2008 | EP1899632A1 A piston, a ring and a piston assembly for a two cycle engine |
| 03/18/2008 | US7345293 Device and method for inspecting piston ring |
| 03/13/2008 | US20080060604 Internal combustion engine |
| 03/12/2008 | CN201034158Y Novel compression piston ring |
| 03/12/2008 | CN101139956A One-groove multi-loop piston |
| 03/11/2008 | US7341256 Seal ring |
| 03/06/2008 | DE102006046915B3 Piston ring has carrier material, particularly steel or casting material, where wear resistant coating is made of alternately built multi coat layer system, where each periodicity comprises of two individual layers |
| 03/05/2008 | CN201031739Y Improved sealing piston ring |
| 03/05/2008 | CN201031738Y Riveting type biplate gas ring |
| 03/05/2008 | CN201031737Y Wear resistant hard chromium piston ring |
| 02/27/2008 | CN201027967Y Combined piston ring |
| 02/27/2008 | CN201027574Y Sealing piston ring with circular arc rabbet |
| 02/21/2008 | DE102006046917B3 Piston ring for use in diesel engine and petrol engine, comprises adjacent individual layers having different metallic elements within periodicity, where individual layers have specific thickness and piston ring is made of carrier material |
| 02/20/2008 | CN201025154Y A 2.2L TCI petrolic engine piston ring |
| 02/20/2008 | CN201025153Y Sealing piston ring of gas engine |
| 02/20/2008 | CN201025152Y Automatic expander for piston loop |
| 02/20/2008 | CN201025126Y Two stroke and dual piston vertical engine |
| 02/20/2008 | CN201025112Y A 2.8L turbine pressure increase middle cooling diesel machine |
| 02/19/2008 | US7332199 Piston ring coated with a coating material by a thermal spraying, exposed to heat treatment to at least partially diffuse the coating material into the piston ring surface or underlying layer of coating material, additionally applied coating material layer subject to successive heat treatments |
| 02/14/2008 | WO2008017195A1 A piston ring without end clearance and a piston with said ring |
| 02/14/2008 | DE102007033811A1 Kraftmaschine Combustion engine |
| 02/07/2008 | WO2008016010A1 Piston ring |
| 02/07/2008 | WO2008016009A1 Piston ring |
| 02/07/2008 | WO2007089924A3 Internal combustion engine |
| 02/07/2008 | US20080029969 Jet pump slip joint piston ring seal |
| 02/06/2008 | CN201016312Y Sealed piston ring |
| 02/06/2008 | CN201016311Y Integral piston ring |
| 02/06/2008 | CN201016310Y Integral piston ring |
| 02/06/2008 | CN100366883C 往复式发动机 Reciprocating engines |
| 01/31/2008 | DE102007033728A1 Oberflächenbehandelter Kompressionsring und Herstellungsverfahren Surface treated compression ring and manufacturing processes |
| 01/31/2008 | DE102006030881A1 Two-piece oil wiper ring, has bearing surface rod provided with wear protection section and exhibiting symmetrical round surface chamfer such that surface chamfer running from edges of running surface rod begins with radius |
| 01/31/2008 | DE10030368B4 Verfahren zum Ermitteln des Formfüllungsvermögens von Kolbenringen Method for determining the mold filling assets of piston rings |
| 01/30/2008 | CN201013473Y Combined type novel piston ring |
| 01/30/2008 | CN201013472Y Novel combined type piston ring |
| 01/30/2008 | CN101113698A Surface treated compression ring and method of manufacture |
| 01/24/2008 | WO2008010490A1 Cycloid reciprocating engine and pump employing this crank mechanism |
| 01/16/2008 | EP1878901A1 Reciprocating engine |
| 01/15/2008 | US7318963 Composite chromium plating film and sliding member having the same and method for manufacture thereof |
| 01/10/2008 | US20080007006 Piston ring for internal combustion engines |
| 01/09/2008 | EP1876345A1 Piston ring for internal combustion engines |
| 01/09/2008 | CN201003605Y Piston ring slantly inserted seal pressure ring combination |
| 01/09/2008 | CN201003432Y Bidirectionally closed type piston ring |
| 01/09/2008 | CN101100963A Piston ring for internal combustion engines |
| 01/09/2008 | CN101100722A Material for manufacturing aluminum piston abrasion-proof inserted ring |
| 01/09/2008 | CN100360701C Heat spraying of piston ring |
| 01/02/2008 | CN200999666Y Internal combustion engine full-closed piston gas ring |
| 12/27/2007 | US20070296154 Sealing device |
| 12/27/2007 | DE19905518B4 Eine Kombination von Kolbendichtringen zur Verwendung bei Verbrennungskraftmotoren A combination of compression rings for use in internal combustion engines |
| 12/26/2007 | CN101092674A Nitrogen contained austenitic cast iron in use for beset ring of piston |
| 12/20/2007 | DE102006024098A1 Piston for internal combustion engine has cooling channel enclosing access channel narrowing in cross-section towards piston floor, inclined to annular field, leading directly or indirectly to annular support |
| 12/13/2007 | DE102005019500B4 Schraubendruckfeder für Ölabstreifkolbenringe Helical compression spring for Ölabstreifkolbenringe |
| 12/11/2007 | US7306234 Oil control ring for pistons of internal combustion engines |
| 12/05/2007 | CN200985837Y Piston ring of engines |
| 12/05/2007 | CN100353047C Novel process for making piston ring |
| 11/29/2007 | US20070272078 Piston Device for Internal Combustion Engine |
| 11/28/2007 | CN200982239Y One-trough multiple-ring type piston air ring |
| 11/28/2007 | CN101078382A Combined sealing gas ring |
| 11/28/2007 | CN101078366A CG150 engine applying lightweight optimization and dynamic balance optimization technique |
| 11/22/2007 | DE102006023396A1 Verschleißschutzeinrichtung und Verfahren zur Herstellung einer solchen Wear protection means and methods for producing such |
| 11/21/2007 | CN200978734Y Leakage-free gas channel compression ring |
| 11/21/2007 | CN200978733Y Self-regulation complementary type piston ring |
| 11/15/2007 | US20070261658 Piston For Internal-Combustion Engine And Combination Of Piston And Piston Ring For Internal-Combustion Engine |
| 11/15/2007 | DE102006030348B3 Ölabstreifring Oil ring |
| 11/15/2007 | DE102006022027A1 Kolbenring für den Kolben eines Verbrennungsmotors Piston ring for the pistons of an internal combustion engine |
| 11/14/2007 | CN101070796A Method for forcibly changing rotating position of piston ring and cross-type two-stroke diesel engine |