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| Number | Title | Issue Date |
| 8188642 | Spark plug for internal combustion engine A spark plug 1 includes an insulator 2, a metal shell 3, a center electrode 5 and a ground electrode 27. A spark discharge gap 33 is formed between a front end portion 28 of the center electrode 5 and the groun... | 05/29/2012 |
| 8138660 | Plasma jet spark plug A plasma jet spark plug comprising: a center electrode; an insulator having an axial bore extending in an axial direction, and retaining the center electrode within the axial bore; a metallic shell... | 03/20/2012 |
| 8115372 | Spark plug for internal combustion engine and method of manufacturing the same A spark plug for an internal combustion engine, includes: a cylindrical insulating body; a center electrode; a cylindrical metal shell; and a ground electrode, as defined herein, wherein the noble metal tip is bonded to the ground electrode via a molten bond, and wh... | 02/14/2012 |
| 8093791 | Spark plug having particular insulator An object of the invention is to provide a spark plug including an insulator which is difficult to cause breakdown and exhibits higher withstand voltage characteristics. This invention relates to a spark plug 1 including a center electrode 2, an insula... | 01/10/2012 |
| 8058786 | Dielectric enhanced partial thread spark plug A small diameter spark plug configuration is provided, the configuration has been found to provide additional volume for the insulator member. That is, by limiting the overall number of threads on the intermediate portion along with a limit of the overall diameter o... | 11/15/2011 |
| 8058785 | Spark plug structure for improved ignitability Exemplary embodiments of the present invention provide a spark plug for use in conjunction with an internal combustion engine, and, more particularly, to a spark plug having a structure providing improved ignition capability. In one particular configuration, a spark... | 11/15/2011 |
| 8053966 | Ceramic spark plug insulator and method of making An insulator for a spark ignition device is disclosed which includes an electrically insulating ceramic core tube having a terminal end, a firing end and an inner bore which extends along a longitudinal bore axis from the terminal end to the firing end and an electr... | 11/08/2011 |
| 8035286 | Spark plug casing and spark plug having the spark plug casing A spark plug casing includes a single-piece shell having a nut portion, first and second tubular portions and a converging shell portion, which are configured to be removed from a cylinder head as an integral device. The first tubular portion extends from the nut po... | 10/11/2011 |
| 7928642 | Open-chamber multi-spark plug An internal combustion engine radio frequency spark plug including two plasma-generating electrodes, separated by an insulator, that constitute respectively an outer shell enclosing the insulator and a central electrode housed in a central bore of the insulator. The... | 04/19/2011 |
| 7923910 | Spark plug having a metallic shell with defined relationship between its outer and inner surfaces A spark plug including an insulator and a metallic shell having an outer surface and an inner surface. The outer surface has a taper portion which comes into contact with a peripheral region around a mounting hole of an internal combustion engine, a tool engagement ... | 04/12/2011 |
| 7893604 | Spark plug with stream shaper to shape tumble vortex into desired stream in combustion chamber A spark plug for an internal combustion engine is provided which includes a hollow cylindrical metal shell with an open end portion to be exposed to a combustion chamber of the engine, a ground electrode joined to the metal shell, a center electrode disposed in the ... | 02/22/2011 |
| 7847473 | Spark plug A spark plug in which a distal end portion (60) of a crimp portion (53) of a metallic shell (50) is crimped by bending the distal end portion inward, whereby the metallic shell (50) and an insulator (10) are fixed together with a f... | 12/07/2010 |
| 7839065 | Plasma jet spark plug and manufacturing method therefor A plasma jet spark plug and a manufacturing method therefor are disclosed. In a state in which a noble-metal chip having a flange-like outwardly projecting portion is disposed in a communication section of a ground electrode, an electrode base metal of the ground el... | 11/23/2010 |
| 7825572 | Spark plug A spark plug including a center electrode; an insulator; and a metal shell, wherein the metal shell includes: a mounting portion; a cylindrical portion; a seal portion; a crimping portion; and a buckled portion all as defined herein, and a relationship A | 11/02/2010 |
| 7825573 | 14 mm extension spark plug A spark plug assembly (10) for engine applications where the combustion chamber is difficult to access when servicing or replacing a spark plug. The spark plug assembly (10) includes a fairly traditional spark plug component (28) to which an elo... | 11/02/2010 |
| 7816846 | Spark plug with slant peripheral surface A spark plug for an internal combustion engine is provided which includes a hollow cylindrical metal shell with an open end portion to be exposed to a combustion chamber of the engine, a ground electrode joined to the metal shell, a center electrode disposed in the ... | 10/19/2010 |
| 7781949 | Spark plug A spark plug including a ground electrode which has an excellent heat sinking ability. The ground electrode includes a core material therein. Heat received from a combustion chamber during a drive of an internal-combustion engine can be conducted to the core materia... | 08/24/2010 |
| 7768184 | Spark plug with stream shaper to shape tumble vortex into desired stream in combustion chamber A spark plug for an internal combustion engine is provided which includes a hollow cylindrical metal shell with an open end portion to be exposed to a combustion chamber of the engine, a ground electrode joined to the metal shell, a center electrode disposed in the ... | 08/03/2010 |
| 7741763 | Spark plug A spark plug including a center electrode; an insulator; a metal shell; a ground electrode; and an annular packing, all as defined herein, wherein the packing has a hardness greater than or equal to a hardness of the stepped portion of the metal shell or has a Vicke... | 06/22/2010 |
| 7741762 | Dual-spark pre-chambered spark igniter A dual-electrode spark igniter (spark plug), which has two electrodes extending from the plug body. During a spark event, electricity flows across a first spark gap from a first electrode to a second electrode. Electricity also flows across a second spark gap from t... | 06/22/2010 |
| 7723906 | Spark plug designed to minimize drop in insulation resistance A spark plug for an internal combustion engine is provided which includes a metal shell, a porcelain insulator, a center electrode, and a ground electrode. The center electrode is retained in the porcelain insulator to define a spark gap between itself and the groun... | 05/25/2010 |
| 7659655 | 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... | 02/09/2010 |
| 7652414 | Spark plug having an inductive upper portion incorporating a coil wound around an elastically deformable core element A spark plug for an internal combustion engine of a motor vehicle; the spark plug is embodied with a generally essentially long shape and includes: an essentially capacitive lower part including two coaxial electrodes, one of which is a central electrode, and the ot... | 01/26/2010 |
| 7569979 | Spark plug having spark portion provided with a base material and a protective material A spark plug having a center electrode and a ground electrode wherein the spark portion of at least one of the center electrode and ground electrode includes a base material and a protective material that substantially prevents corrosion of the base material. ... | 08/04/2009 |
| 7557496 | Spark plug which can prevent lateral sparking A spark plug including: a center electrode (20); an insulator (10) having an axial hole (12) extending in an axial direction of the center electrode (20) and holding the center electrode (20) in the axial hole (12); a cylind... | 07/07/2009 |
| 7557495 | Spark plug having precious metal pad attached to ground electrode and method of making same A spark plug having a ground electrode with a precious metal pad welded to the ground electrode through a series of weld steps. The precious metal pad is a Pt-based pad which is attached to a side surface of the ground electrode via an attachment process that includ... | 07/07/2009 |
| 7528534 | Spark plug There is provided a spark plug wherein an insulator and a metallic shell, when observed in a section made by a plane including an axis of a spark plug, have therebetween a gap of less than 0.45 mm at a more front end side than an engagement position of a packing and... | 05/05/2009 |
| 7477008 | Plasma jet spark plug A plasma jet spark plug for internal combustion engines includes a center electrode, a shot channel defined by insulation material, and a ground electrode concentric with the shot channel. The center electrode has a conical shape and the ground electrode defines an ... | 01/13/2009 |
| 7432641 | Spark plug A plurality of insulator samples of different dimensions are subjected to multiple regression analysis to thereby induce an expression for estimating the amount of unevenness in wall thickness of an insulator; specifically, 0.01 (17.527+0.141A−0.285B−6.124C−0.... | 10/07/2008 |
| 7408294 | Spark plug with high capability to ignite air-fuel mixture A spark plug according to the invention includes a metal shell, a hollow insulator, a center electrode, and a ground electrode. The insulator has a first end protruding into a combustion chamber of an engine and a second end opposite to the first end in the lengthwi... | 08/05/2008 |
| 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 |
| 7400081 | Compact spark plug with high gas tightness A spark plug has a compact structure where a threaded portion of a metal shell has a size of M10 or M12 and the width between any two opposite side surfaces of a polygonal prism-shaped portion of the metal shell is no greater than 14 mm. In the spark plug, a thickne... | 07/15/2008 |
| 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 |
| 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 |
| 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 |
| 7372192 | Cathode for cathode ray tube with improved lifetime Impregnated cathode for a vacuum tube comprising an emissive part in the form of a porous pellet impregnated with a compound of alkaline earth metals; the pellet is placed in a dish made of a refractory material and covered with a porous metal foil forming the emiss... | 05/13/2008 |
| 7368864 | Spark plug A spark plug including: an insulator having an axial hole; a center electrode disposed in a tip end side of the axial hole of the insulator; a metal shell surrounding the insulator, a first ground electrode having one end bonded to the metal shell; a noble metal tip... | 05/06/2008 |
| 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 |
| 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 |
| 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 |
