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| Number | Title | Issue Date |
| 8183754 | Alumina-based sintered body for spark plug and method of manufacturing the same, and spark plug and method of manufacturing the same An alumina-based sintered body for a spark plug having enhanced mechanical strength and a method of manufacturing the same, as well as a spark plug having the alumina-based sintered body for a spark plug and a method of manufacturing the same. ... | 05/22/2012 |
| 8143772 | Spark plug comprising a ground electrode support The invention relates to a spark plug of an internal combustion engine, especially for use in Otto gas engines. Said spark plug comprises, supported by an insulating body (1), a preferably one-piece spark plug shell (2) and a center electrode (3... | 03/27/2012 |
| 8040029 | Spark plug for motor vehicle internal combustion engine A spark plug for a motor vehicle internal combustion engine, substantially elongated in shape, and including: two coaxial electrodes of an inner central electrode and an outer base electrode enclosing the central electrode; and an electrically insulating annular blo... | 10/18/2011 |
| 7928641 | Spark plug A spark plug includes a longitudinal bore formed in a housing for receiving an insulator, with the housing having a first bore for receiving a pressure measuring device and a second bore for receiving a light guide which opens into the combustion chamber. ... | 04/19/2011 |
| 7906893 | Spark plug of internal combustion engine having glaze layers on the spark plug There is provided a spark plug of an internal combustion engine, including a cylindrical metal shell, an insulator retained in the metal shell and having a through hole in an axial direction of the spark plug and a center electrode fitted in the through hole of the ... | 03/15/2011 |
| 7834529 | Spark plug with riveted sleeve A spark plug comprising a housing, a ceramic insulator and a sleeve is provided. The housing has an inner cavity while the ceramic insulator encloses a central electrode. The ceramic insulator is disposed inside the inner cavity and maintain from the housing with a ... | 11/16/2010 |
| 7825571 | Spark plug for internal combustion engine A spark plug comprising: a cylindrical metal shell; a cylindrical insulator provided in an inner hole of said metal shell; a center electrode provided in a leading end side inner hole of said insulator; and a ground electrode having one end bonded to a leading end s... | 11/02/2010 |
| 7772751 | Spark plug having a rear-end portion of a threaded portion that has a higher hardness than a crimp portion and method of manufacturing the same A spark plug and method of manufacturing the same, the spark plug including a metal housing holding an insulator therein, the metal housing having a threaded portion formed on an outer circumferential surface of a frontward portion of the metal housing in a crimp po... | 08/10/2010 |
| 7589460 | Small diameter/long reach spark plug with rimmed hemispherical sparking tip A spark plug (10) having an elongated ceramic insulator (12) includes numerous design features in various strategic locations. At least the ground electrode (26) is fitted with a rimmed, hemispherical metallic sparking tip (56) which cont... | 09/15/2009 |
| 7508121 | Small diameter/long reach spark plug A spark plug (10) having an elongated ceramic insulator (12) includes numerous design features in various strategic locations. At least the ground electrode (26) is fitted with a rimmed, hemispherical metallic sparking tip (56) which cont... | 03/24/2009 |
| 7477006 | Spark plug for internal combustion engine and method of manufacturing the same A spark plug for an internal combustion engine includes: a cylindrical insulator as defined herein; a center electrode as defined herein; a cylindrical metal shell as defined herein; and a ground electrode as defined herein, an annular gasket receiving portion proje... | 01/13/2009 |
| 7408293 | Spark plug including ground elcetrode carrier casing A spark plug, in particular for use in internal combustion engines, includes a spark plug casing and a ground electrode carrier casing. The ground electrode carrier casing has at least two ground electrode carrier casing portions having mutually different materials ... | 08/05/2008 |
| 7388323 | Spark plug A spark plug including: an insulator having a through hole extending in an axial direction, the through hole including, a first portion and a second portion provided on a rear end side of the first portion, the second portion having a larger diameter than that of th... | 06/17/2008 |
| 7382084 | Spark plug having a precious metal tip An object of the invention is to provide a spark plug having a discharge portion made of a precious metal tip, in which peeling of the precious metal tip from a surface of the discharge portion can be suppressed while spark abrasion, oxidation abrasion and abnormal ... | 06/03/2008 |
| 7382085 | Spark plug having precious metal tip of specified geometry 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, St is the surface area of th... | 06/03/2008 |
| 7365480 | Spark plug A spark plug including: a external terminal; a center electrode; an insulator having a through hole as defined herein and containing alumina ceramics; and a conductive seal. The conductive seal contains base glass, a conductive filler and from 0 to 10 weight % of an... | 04/29/2008 |
| 7352120 | Ignition device having an electrode tip formed from an iridium-based alloy An ignition device such as a spark plug having ground and center electrodes, at least one of which includes a firing tip formed from an alloy containing iridium, rhodium, tungsten, and zirconium. With the inclusion of tungsten and zirconium in the alloy, the percent... | 04/01/2008 |
| 7347174 | Combustion promoting device for internal combustion engine Disclosed is a combustion promoting device for an internal combustion engine which derives high combustion efficiency and high power from the internal combustion engine. The combustion promoting device is provided with a combustion promotion inductor formed of a sup... | 03/25/2008 |
| 7336024 | Spark plug A spark plug including a noble metal tip bonded to at least one of a front-end portion of a center electrode and an end portion of the ground electrode opposing the center electrode. The noble metal tip contains from 5 to 40 wt % of Rh; from 1 to 20 wt % of at least... | 02/26/2008 |
| 7315110 | Spark plug with easy-to-recognize identification marks A spark plug according to the invention has a length and an outer side surface. The outer side surface includes a plurality of closed band-shaped regions arranged in the lengthwise direction of the spark plug, within each of which a plurality of identical marks, whi... | 01/01/2008 |
| 7298070 | Compact structure of spark plug designed to ensure desired heat range A spark plug for an internal combustion engine is provided which has a center electrode made up of an oxidation resistant alloy-made portion and a thermal conductive metal-made portion. The oxidation resistant alloy-made portion occupies at least a top portion of th... | 11/20/2007 |
| 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 |
| 7279827 | Spark plug with electrode including precious metal An object of the invention is to provide a higher-durability spark plug provided with a center electrode and a side electrode. At least one of the center electrode and the side electrode includes a precious metal member facing a spark discharge gap between the elect... | 10/09/2007 |
| 7259506 | Spark plug with perpendicular knife edge electrodes A spark plug has an elongated body of substantially circular cross-section with a center axis. A wedge shaped center electrode extends from one end of the body and a wedge shaped ground electrode is arranged in close proximity to the center electrode. Each of the el... | 08/21/2007 |
| 7250711 | Spark plug with increased durability and carbon fouling resistance A spark plug for an internal combustion engine is provided which includes a metal shell, a porcelain insulator, a center electrode, a main ground electrode, and auxiliary ground electrodes. Each of the auxiliary ground electrodes has an inner side surface facing the... | 07/31/2007 |
| 7243643 | Ignition device for internal combustion engine An ignition device for an internal combustion engine has a spark plug, an ignition coil, a housing and a mounting portion. The spark plug is for discharging a current to ignite an air-fuel mixture in a combustion chamber of the internal combustion engine. The igniti... | 07/17/2007 |
| 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 |
| 7230369 | Spark plug A spark plug includes a metal shell, an insulator, a center electrode, a ground electrode, and a terminal fixed to the insulator. The dimensional parameters in the structure of the spark plug, such as a maximum diameter A of the terminal and a diameter B of the insu... | 06/12/2007 |
| 7224109 | Spark plug A ground electrode has one end portion fixed to a metal housing, a bent portion provided at an intermediate portion thereof, and the other end portion positioned in a confronting relationship with a center electrode to form a spark discharge gap. The ground electrod... | 05/29/2007 |
| 7224108 | 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 |
| 7215069 | Spark plug A spark plug having a packing interposed between an insulating porcelain and a metallic shell, wherein Young's modulus G of the material forming the metallic shell 50 and Young's modulus F of the material forming the packing 80 satisfies the relation o... | 05/08/2007 |
| 7199511 | 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... | 04/03/2007 |
| 7188466 | Passive, high-temperature amplifier for amplifying spark signals detected in igniter in gas turbine engine A system for detecting spark in an igniter for a gas turbine engine. An igniter generates a plasma, or spark, somewhat similar to an automotive spark plug. In the invention, an inductive pick-up is positioned adjacent the igniter, to detect current pulses in the ign... | 03/13/2007 |
| 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 |
| 7183702 | Spark plug with high insulation properties and high capability to ignite air-fuel mixture A spark plug according to the invention includes a metal shell that has a threaded portion with an outer diameter of 10 mm or less, or equal to 12 mm, an insulator, a center electrode, and a ground electrode. The spark plug has an improved structure in which an end ... | 02/27/2007 |
| 7176608 | Spark plug A spark plug is disclosed as including a metal shell 10 formed with first and second bores 10c, 10d and a stepped section 10e between the first and second bores, and a porcelain insulator 20 having a largest-di... | 02/13/2007 |
| 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 |
| 7164225 | Small size spark plug having side spark prevention A spark plug including an insulator having an axial hole in an axial direction; and a center electrode disposed in a tip end side of the axial hole of the insulator so as to project a tip end of the center electrode from the tip end side of the insulator. The center... | 01/16/2007 |
| 7154213 | Ground electrode structure of a spark plug for a gas engine A spark plug for a gas engine includes a ground electrode body and a center electrode body. A ground electrode of the ground electrode body is welded on a surface of a ground electrode base material opposing to the center electrode body. The ground electrode protrud... | 12/26/2006 |
| 7145287 | Spark plug having noble metal tip A spark plug which satisfies φB≦0.8 mm, φB/φA≧1.4, and 0.5 mm≦C≦1.2 mm, where φA (mm) is the diameter of a distal end portion (51) formed of a noble metal tip (51b) of a center electrode 3; φB (mm) is the diameter of a discha... | 12/05/2006 |
