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| Number | Title | Issue Date |
| 8378560 | Spark plug An ignition part (80) of a ground electrode (30) includes a fused part (85) in which construction materials of a base portion (82) and a noble metal member (81) are fused and mixed by performing laser welding on the two. In the fus... | 02/19/2013 |
| 8188641 | Spark plug A center electrode includes a tapered electrode base member mount and a noble metal tip joined to the electrode base member mount via a fused portion in which the component of the noble metal tip and the component of the electrode base member mount are fused. In thi... | 05/29/2012 |
| 8072125 | Spark plug for use in an internal-combustion engine with a bilayer ground electrode A spark plug 100 comprised of a metal shell 1, an insulator 2, a center electrode 3 and a ground electrode 4. A rear-end face of the ground electrode 4 is welded to a front-end face of the metal shell 1, and a bent po... | 12/06/2011 |
| 7687980 | Spark plug A spark plug comprises: a spark plug housing; an axial core electrode disposed in a longitudinal direction in the spark plug housing; and a ground electrode having a terminal part spaced apart along the longitudinal direction from a distal end of the axial core elec... | 03/30/2010 |
| 7605526 | Spark plug for internal combustion engine A spark plug for an internal combustion engine is disclosed having a metal shell having an outer periphery formed with a mounting thread, a porcelain insulator fixedly secured to the metal shell on a central axis thereof, a center electrode retained within the porce... | 10/20/2009 |
| 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 |
| 7323811 | Noble metal tip for spark plug electrode and method of making same A noble metal tip 20 for attachment to a spark plug center electrode 36 and/or a ground electrode. Noble metal tip 20 is a generally cylindrical component that includes a firing end 40, an attachment end 42, and one or more retenti... | 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 |
| 7293541 | Combustion-type power tool having ignition proof arrangement A spark is shot between an ignition point of an ignition plug and an ignition ground. The spark is shot from an acute corner of a core of the ignition plug. A tip end of the core has an acute angle of not more than 45 degrees. With this arrangement, an emitting poin... | 11/13/2007 |
| 7291961 | Spark plug having a specific structure of noble metal tip on ground electrode A method for producing a spark plug, the spark plug including: a center electrode; an insulator which holds the center electrode therein in a state where a tip end portion of the center electrode protrudes therefrom; a metal shell which holds the insulator therein; ... | 11/06/2007 |
| 7288879 | Spark plug having ground electrode including precious metal alloy portion containing first, second and third components A spark plug including: a cylindrical metal shell; a cylindrical insulator fixed to the metal shell; a center electrode having its leading end protruding from a leading end of the insulator and its trailing end fixed to the insulator; and a ground electrode having o... | 10/30/2007 |
| 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 |
| 7221078 | Spark plug with improved noble metal chip In a spark plug composed of a center electrode and an earth electrode, at least one of confronting portions of the center electrode and the earth electrode which are in opposed relation to each other is constructed with a noble metal chip containing Pt as a principa... | 05/22/2007 |
| 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 |
| 7170219 | Spark plug with multiple ground electrodes A spark plug according to the present invention includes a metal shell, an insulator, a cylindrical center electrode, a first ground electrode, and a second ground electrode. The first ground electrode is aligned with the center electrode in the axial direction of t... | 01/30/2007 |
| 7150252 | Spark plug and internal combustion engine equipped with the spark plug In a spark plug 100, the nickel content of a center electrode 20 is greater than that of a ground electrode 30. This enhances resistance to spark-induced consumption of the center electrode 20. Also, the ground electrode 30 to whic... | 12/19/2006 |
| 7148612 | Spark plug with inclined electrode spark surfaces A spark plug comprises an electrically-insulating sleeve (12) extending along a central axis (14) of the plug, a first electrode (16) having a tip (20), an electrically-conducting shell (22), and a second electrode (26) moun... | 12/12/2006 |
| 7122948 | Spark plug having enhanced capability to ignite air-fuel mixture A spark plug includes a metal shell, an insulator, a center electrode, and a ground electrode. The metal shell has a threaded portion with an outer diameter of equal to or less than 10 mm, or equal to 12 mm for installing the spark plug in an internal combustion eng... | 10/17/2006 |
| 7116041 | Spark electrode assembly A spark electrode assembly has an elongate electrode with an inner insulator arranged for operable attachment to a support structure. The inner insulator surrounds the electrode with one end of the electrode positioned adjacent a ground element across a spark gap an... | 10/03/2006 |
| 7105990 | Spark plug for internal combustion engine Carbon fouling adhered on an insulator tip of a spark plug of the present invention is burnt down by a leak current during an inductive discharge period, due to a promoted ionization before beginning a capacitive discharge, in such an arrangement of a central electr... | 09/12/2006 |
| 7043813 | Manufacturing method for a spark plug In a bond step, one end of ground electrode is bonded to a metallic housing. In a provisional bending step performed after the bonding step, an intermediate portion of the ground electrode is bent with a pressing die so that the other end of the ground electrode is ... | 05/16/2006 |
| 6885136 | Ignition device having an electrode 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... | 04/26/2005 |
| 6885137 | Spark plug and its manufacturing method Ir alloy firing tips are bonded on opposed surfaces of a center electrode and a ground electrode facing to a discharge gap. The configuration of a cross-sectional area of the Ir alloy firing tip taken along a plane perpendicular to the axis of the Ir alloy firing ti... | 04/26/2005 |
| 6858985 | Low-pressure gas discharge lamp The invention relates to a low-pressure gas discharge lamp which includes at least one discharge vessel and at least two capacitive coupling-in structures and operates at an operating frequency f. In order to achieve a better efficiency in combination with a small s... | 02/22/2005 |
| 6798125 | Spark plug having ground electrode made of NI alloy and noble metal wear resistant portion In a spark plug (100), at least one side face of the ground electrode (4) is made of an electrode base material comprising an Ni alloy containing 21-25% by mass of Cr, 1-2% by mass of Al, 7-20% by mass of Fe and 58-71% by mass of Ni. The noble metal we... | 09/28/2004 |
| 6791246 | Spark plug and method for its manufacture A method for manufacturing spark plugs with central and body electrode(s) armed with noble metal inserts, in which the tip of a central electrode which is pyramid or conic shaped with a base diameter (d), is liquefied by being pressed against a noble metal ball with... | 09/14/2004 |
| 6750597 | Method for manufacturing spark plug and spark plug A method for manufacturing a spark plug having a center electrode, an insulator disposed around the center electrode, a metallic shell disposed around the insulator, a ground electrode disposed in opposition to the center electrode so as to form a spark discharge ga... | 06/15/2004 |
| 6724132 | Spark plug for an engine for a cogeneration system In a side ground electrode type of spark plug, sizes of discharge members are optimized to reduce a useless portion in discharging to improve discharge wear resistance. A first discharge member mainly comprising Ir alloy is welded to the central electrode. A second ... | 04/20/2004 |
| 6724133 | Spark plug with nickel alloy electrode base material A spark plug having a center electrode 2 formed from an electrode base material 2n, which is made of an Ni alloy containing an alloy component (e.g., Cr) capable of forming an oxide semiconductor having a resistivity of negative temperature coef... | 04/20/2004 |
| 6676468 | Method of producing a spark plug In producing a spark plug including a central electrode having a first chip including noble metal and an earth electrode having a second chip including the noble metal, a spark gap being disposed between the first and second chips, a chip including the no... | 01/13/2004 |
| 6664719 | Spark plug A spark plug having a discharge portion formed of a noble-metal chip, the spark plug being capable of restraining wear observed on a slenderized discharge portion in particular. Discharge portion (31) includes noble-metal chip (31'). Dimension D is 0.3-0.... | 12/16/2003 |
| 6653767 | Spark plug and ignition apparatus At least one of a center electrode tip and a ground electrode tip is made of an iridium alloy. A discharge gap, formed between the center electrode tip and the ground electrode tip, is less than 1.1 mm. And, cross sections of the center electrode tip and ... | 11/25/2003 |
| 6628050 | Spark plug A spark plug includes a metallic shell having a stepped portion an insulator disposed inside the metallic shell, while being engaged with the stepped portion of the metallic shell, and having an axially extending through hole; a center electrode fixed wit... | 09/30/2003 |
| 6611084 | Spark plug A tip portion of a center electrode 2 of a spark plug includes a tapered portion which is tapered such that the diameter reduces axially frontward. A convex portion 2k is formed at an axially intermediate position of the tapered portion so as to project r... | 08/26/2003 |
| 6603246 | Spark plug used for cogeneration purpose and adjusting method for discharging gap thereof A noble metal tip of a grounding electrode is inclinedly disposed with respect to a noble metal chip of a central electrode by an angle so that a discharging gap is narrow at a side closer to one end of the grounding electrode and wide at the oppo... | 08/05/2003 |
| 6603245 | Three-dimensional multiple series gap spark plug In accordance with the present invention, there is provided a spark plug for producing a plurality of sparks which define a three-dimensional volume in a combustion chamber of an internal combustion engine. The spark plug is provided with an insulative bo... | 08/05/2003 |
| 6573641 | Spark plug A spark plug is provided which comprises a center electrode and a ground electrode having at a free end portion thereof a discharge surface which is opposite to an axial end surface of the center electrode to provide therebetween a spark gap, wherein the ... | 06/03/2003 |
| 6559579 | Alumina-based sintered body insulator for spark plugs An insulator for spark plug comprises an alumina-based sintered body comprising: Al2 O3 as a main component; and at least one component (hereinafter referred to as "ଲ component") selected from the group consisting of Ca compone... | 05/06/2003 |
| 6552476 | Spark plug for internal combustion engine having better self-cleaning function A first gap discharge gap is located between a front end of a center electrode and a front side of a first ground electrode of a spark plug. A second discharge gap is located between a front end of a second ground electrode and a front side of the center ... | 04/22/2003 |
