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| Number | Title | Issue Date |
| 8167673 | Method for manufacturing a spark plug having a laterally oriented ground electrode A method for manufacturing a spark plug having a central electrode and a ground electrode, the central electrode and the ground electrode being spaced apart from each other and a first planar electrode face being formed on the central electrode and a second planar e... | 05/01/2012 |
| 8128446 | Method for manufacturing a spark plug insulator including steps for forming a through hole therein A method for manufacturing an insulator for a spark plug is provided. The method includes: a preparing step; a press pin arranging step; a powder filling step after the press pin arranging step; a cavity blocking step after the powder filling step; a compression mol... | 03/06/2012 |
| 8092269 | Method of manufacturing spark plug A decrease in yield and degradation of productivity can be avoided when a spark plug having an insulator with low mechanical strength is manufactured. In a second process, a terminal electrode 15 is inserted to a predetermined position in a state where an ins... | 01/10/2012 |
| 8087961 | Method of producing a spark plug that has a high dimensional accuracy in the spark gap For producing a spark plug that has a high dimensional accuracy in the spark gap, a method is disclosed which comprises (a) preparing a semi-finished spark plug unit (100b) which comprises a center electrode (20) that has a leading end portion (... | 01/03/2012 |
| 8052495 | Method for producing spark plug by projection welding and spark plug thereof A spark plug (100) including a center electrode (130) and a ground electrode (140), which is formed by joining a ground electrode chip (143) to a ground electrode base material (141) via an intermediate member (142). A metho... | 11/08/2011 |
| 8033880 | Method for manufacturing spark plug A method for manufacturing a spark plug which includes: (a) preparing a metal shell; (b) preparing an insulator; (c) inserting the insulator in an insertion hole of the metal shell; (d) forming an intended crimping portion of the metal shell into a crimping portion;... | 10/11/2011 |
| 7980908 | Spark plug and method for production of a spark plug The invention describes a spark plug having an outer electrode (12), a central electrode (10), an inner conductor (2) connected to the central electrode (10) and an insulator (3) enclosing the inner conductor (2). It is prov... | 07/19/2011 |
| 7959482 | Manufacturing method for ignition plug involves removing leading end portion of shell extended from end surface of insulator A manufacturing method for an ignition plug is provided. The method includes: preparing an insulator having a cavity provided at a leading end portion thereof by disposing a leading end of the center electrode more inwards than a leading end of the insulator; buildi... | 06/14/2011 |
| 7922551 | Pre-chamber spark plug A method and apparatus to maximize spark plug life in pre-chamber spark plugs operating with ultra-lean mixtures and/or elevated engine BMEP is presented. Electrode erosion is reduced by spreading discharge energy over a wider surface area, maintaining fuel concentr... | 04/12/2011 |
| 7914353 | Spark plug and method for manufacturing the same A method for manufacturing a spark plug and a spark plug manufactured by the method in which a gasket used for securing the air-tightness when mounting the spark plug on an internal-combustion engine is prevented from falling out from the metal shell with a simple s... | 03/29/2011 |
| 7901262 | Spark plug manufacturing method ensuring accurate and effective adjustment of spark gap A method of manufacturing a spark plug includes the step of adjusting a spark gap in the spark plug. In the step, a ground electrode is repeatedly pressed, by a hammer, toward a center electrode. The hammer operates in a first mode when the size of the spark gap fal... | 03/08/2011 |
| 7896720 | Method of producing spark plug, and spark plug A method of producing a spark plug includes reducing the diameter of a center electrode while maintaining the heat dissipation property of the center electrode. A columnar member in which an outer skin member and a core member having a high thermal conductivity are ... | 03/01/2011 |
| 7740513 | Method and device for manufacturing a noble metal armored electrode for a sparking plug Method and device for manufacturing a noble meal reinforced electrode for a spark plug. A base electrode element (1) is formed and positioned in a retaining attachment (2). A noble metal piece (3) is arranged by a suitable attachment (4) ... | 06/22/2010 |
| 7666047 | Method for securing a metal noble tip to an electrode of a spark plug using a resistance and laser welding process There is provided a method for producing a spark plug in which welding strength between a noble metal tip and an electrode joined by laser welding can be restrained from becoming weak. A noble metal tip (90) to be joined to a center electrode (2... | 02/23/2010 |
| 7637793 | Spark plug and method for producing it A spark plug for an internal combustion engine, the spark plug having at least two electrodes, in which the electrodes are formed of a first part made of a substrate material and a surface part more durable than the substrate material. The surface part of the spark ... | 12/29/2009 |
| 7581998 | Method for regulating aground electrode position in spark plug A method and apparatus for manufacturing a spark plug, the spark plug being defined herein, the method including a center electrode position measuring step of measuring an X-directional position of the front end of the center electrode; a regulation member positioni... | 09/01/2009 |
| 7385339 | Ignition device having a reflowed firing tip and method of making A sparkplug having ground and center electrodes that include a firing tip formed from a noble metal or noble metal alloy by reflowing of a noble metal preform. The present invention also includes a method of manufacturing a metal electrode having an ignition tip for... | 06/10/2008 |
| 7352121 | Spark plug A spark plug having a protrusion amount t of not smaller than 0.3 mm and satisfying a relation θ1+θ2≦93° in which θ1 is an included angle between virtual lines s1 and s2, and θ2 is an included angle between virtual lines s | 04/01/2008 |
| 7346983 | Method for manufacturing spark plug A spark plug is provided, for a provisional bending process for manufacturing the spark plug, as a work in a condition where an earth electrode is straight and substantially in parallel with an axial line of a center electrode. In the provisional bending process, tw... | 03/25/2008 |
| 7323810 | Spark plug for an internal combustion engine A spark plug for an internal combustion engine comprising a centre electrode and an earth electrode serving as a spark discharge section, as well as a noble metallic chip, which is inserted into one end of at least one of said electrodes along part of its length and... | 01/29/2008 |
| 7321187 | Spark plug and method for manufacturing the spark plug A ground-electrode spark portion 32 is formed from a noble metal which contains Pt as a main component, and is joined to a main metal portion of the ground electrode 4 via an alloy layer which has a thickness ranging from 0.5 μm to 100 μm and in whic... | 01/22/2008 |
| 7306502 | Spark plug with noble metal chip joined by unique laser welding and fabrication method thereof A spark plug is provided which ensures the reliability of a weld between a noble metal chip and a ground electrode as well as higher durability and ignitability of fuel. The ground electrode is joined to a metal shell, after which the noble metal chip is laser-welde... | 12/11/2007 |
| 7282844 | High performance, long-life spark plug A spark plug includes a metal shell, an insulator, a center electrode, a ground electrode, a first noble metal chip, and a second noble metal chip. The metal shell has a threaded portion with an outer diameter of equal to or less than 14 mm for installing the spark ... | 10/16/2007 |
| 7261609 | Spark plug manufacturing apparatus and method of manufacturing spark plug The spark plug manufacturing apparatus includes a holding plate formed with a plurality of mounting holes penetrating from a front surface to a rear surface thereof for holding therein hollow tubular insulators of spark plugs, each of which is fitted therein with a ... | 08/28/2007 |
| 7234429 | Spark plug with increased durability A spark plug is provided which is designed to be compact without sacrificing a mechanical strength of a porcelain insulator. The spark plug includes a metal shell having a base end and a top end. The porcelain insulator is made of a hollow cylinder which includes a ... | 06/26/2007 |
| 7224110 | Starting element having ceramic component electrostatically coated with a dry glaze A method for manufacturing a starting element, in particular a sheathed-element glow plug, for the combustion process in an internal combustion engine having a ceramic element (1, 3) is proposed, which substantially improves the glazing of the ceramic element... | 05/29/2007 |
| 7223144 | Low cost spark plug manufactured from conductive loaded resin-based materials Spark plug devices are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers in a base resin host. The pe... | 05/29/2007 |
| 7192324 | Method for producing a spark plug electrode A method of joining an electrode of a spark plug with a noble metal is described, the noble metal being joined locally with the electrode using a thermal input produced by a continuously operating laser beam. ... | 03/20/2007 |
| 7190106 | Spark plug with ground electrode having mechanically locked precious metal feature A ground electrode for a spark plug has a through hole located adjacent a firing end of the electrode, with a precious metal firing tip extending through the hole. The firing tip is compressed axially to define a bulging portion extending radially outwardly from its... | 03/13/2007 |
| 7187110 | Spark plug In a first embodiment a spark plug satisfying the relations: t≧0.3 mm and St/Sw≦7 in which t is the axial-direction shortest distance between a leading end surface 41a of a precious metal tip 41 and a joint portion 43, St is the surfa... | 03/06/2007 |
| 7172483 | Method of making metallic shell for spark plug, method of making spark plug having metallic shell and spark plug produced by the same A method of making a metallic shell for a spark plug. The metallic shell includes a multi-stepped through hole, an intermediate tubular portion, a tip end side tubular portion and a base end side tubular portion. The through hole includes a large diameter hole secti... | 02/06/2007 |
| 7169723 | Ceramic with improved high temperature electrical properties for use as a spark plug insulator A ceramic includes alumina in an amount between about 90 and about 99% by weight, a zirconium containing compound in an amount between about 0 and about 1% by weight, and an oxide mixture in an amount between about 1 and about 10% by weight. The oxide mixture includ... | 01/30/2007 |
| 7132782 | Spark plug and method of producing spark plug A spark plug includes a center electrode, a ground electrode opposing the center electrode in such a manner as to define a spark discharge gap between the center electrode and the ground electrode, and an igniter fixed to at least one of the center electrode and the... | 11/07/2006 |
| 7131191 | Method for manufacturing noble metal electric discharge chips for spark plugs In a wire drawing process for forming a wire rod containing iridium as a main component and which further contains nickel and at least one of platinum, rhodium and ruthenium, and having a cross-sectional area of not smaller than 0.05 mm2 and not larger th... | 11/07/2006 |
| 7128630 | Method for manufacturing a spark plug with glaze coating A spark plug includes a ceramic component, whose surface is at least in part coated with a glaze, with the glaze containing 0.6% to 4% by weight of fluoride and 6% to 11.2% by weight of zinc oxide. ... | 10/31/2006 |
| 7112112 | Method and apparatus for making a spark plug with a predetermined spark gap A method for making a spark plug is provided. The method comprises the steps of, for adjustment of a spark gap, provisionally pressing a ground electrode toward a leading end surface of a center electrode and thereby decreasing the spark gap to a predetermined value... | 09/26/2006 |
| 7105991 | Spark plug with sealing ring around center electrode A spark plug is disclosed. The spark plug has a ceramic insulator body and a center electrode that is housed at least partially in a bore in the insulator body. The center electrode is sealed off from the insulator body by at least one sealing ring surrounding the c... | 09/12/2006 |
| 7097525 | Method for manufacturing spark plug using bending process for earth electrode A spark plug is provided after a provisional bending process, during which the earth electrode is provisionally bent at almost 90 degrees. The earth electrode, one of both ends is joined to a housing member, has first and second end-side surfaces located mutually ba... | 08/29/2006 |
| 7083488 | Method for manufacturing spark plug and apparatus for manufacturing spark plug A method and apparatus for manufacturing a spark plug which avoids depth insufficiency of the weld metal portion or thickness insufficiency of the spark portion and which thus enhances the weld strength and service life of the spark portion. According to the method,... | 08/01/2006 |
| 7084558 | Spark plug and method for manufacturing the spark plug A ground-electrode spark portion 32 is formed from a noble metal which contains Pt as a main component, and is joined to a main metal portion of the ground electrode 4 via an alloy layer which has a thickness ranging from 0.5 μm to 100 μm and in whic... | 08/01/2006 |
