| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 313142000 | Gap on and along axis | 13 |
| 20080238282 | METHOD FOR PRODUCING SPARK PLUG AND SPARK PLUG - A spark plug ( | 10-02-2008 |
| 20090009048 | SPARK PLUG - A spark plug ( | 01-08-2009 |
| 20100320894 | SPARK PLUG HAVING LONG SERVICE LIFE - A spark plug, including a central electrode, a first ground electrode, which is situated in a curved shape having a horizontal area and an essentially vertical area, and at least one second ground electrode, which is situated adjacent to the central electrode in such a way that a distance between the first ground electrode and the central electrode is less than a distance between the second ground electrode and the central electrode. | 12-23-2010 |
| 20110095672 | SPARK PLUG - A spark plug capable of preventing breakage of a ground electrode. The spark plug is comprised of a ground electrode having a base end portion fixed to a metal shell, a bend portion integrally formed with the base end portion and being bent and a front end portion integrally formed with the bend portion and forming a spark discharge gap “g” with a center electrode. The ground electrode is comprised of a core extending from the base end portion towards the front end portion through the bend portion; and an outer layer disposed outside the core and extending from the base end portion up to the front end portion through the bend portion. The core is made of Hastelloy C serving as a first metal, and the outer layer is made of Inconel 601 serving as a second metal. Hardness of Hastelloy C is higher than that of Inconel 601. | 04-28-2011 |
| 20130009539 | SPARK IGNITION DEVICE AND GROUND ELECTRODE THEREFOR AND METHODS OF CONSTRUCTION THEREOF - A spark ignition device, ground electrode therefor, and methods of construction thereof are provided. The spark ignition device includes a generally annular ceramic insulator with a metal shell surrounding at least a portion of the ceramic insulator. A center electrode is received at least in part in the ceramic insulator and a ground electrode extends from the shell to a free end portion. A firing tip is attached adjacent the free end portion of the ground electrode to provide a spark gap between the center electrode and the firing tip. The free end portion is at least partially bounded by at least one “as laser cut” peripheral side extending adjacent the firing tip. | 01-10-2013 |
| 20130099655 | SPARK PLUG - A spark plug includes a ground electrode. The cross sectional area S of a ground electrode base member of the ground electrode satisfies a relation 1.8 mm | 04-25-2013 |
| 20130187530 | METHOD OF PRODUCING AN ELECTRODE SUPPORT USING BRAZING - A method of producing an electrode support for a spark plug is provided. The method includes providing the electrode support. The method includes brazing a chip to the electrode support. | 07-25-2013 |
| 20130278133 | SPARK PLUG AND METHOD OF MANUFACTURING THE SAME - A spark plug includes: a rod-shaped center electrode extending in an axial direction; an insulator including a shaft hole that holds the center electrode inside of the shaft hole; a metal shell surrounding and holding a part of the insulator; and a ground electrode including a base end welded to the metal shell. The metal shell and the ground electrode are joined via a fusion portion formed by welding the ground electrode and the metal shell together. When the smallest thickness of the fusion portion in the axial direction is A, when, in a cross section that includes a center line of the ground electrode and is parallel to the axis, a length of a ground-electrode-side melted boundary formed between the fusion portion and the ground electrode is B, and when the ground electrode thickness is C, conditions of A≧0.2 mm and B >C are satisfied. | 10-24-2013 |
| 20150325983 | ELECTRODE BEAM WELDED SPARK PLUGS FOR INDUSTRIAL ELECTRODES - An industrial spark plug ( | 11-12-2015 |
| 20150333487 | IGNITION PLUG - A spark plug has a metal shell and a cylindrical ceramic insulator disposed in an inner circumference of the metal shell. An axial hole extends in an axial line CL direction through the insulator, and has a tip located more to a tip side of the spark plug than a tip of the metal shell, and a distance along the axial line CL | 11-19-2015 |
| 20150340843 | SPARK PLUG - A spark plug includes a portion from a position at a distance of 0.1 mm from a base end to a distal end that is categorizable into a high hardness portion and a low hardness portion using a hardness distribution of a ground electrode, the high hardness portion being a portion from the position at a distance of 0.1 mm from a base end to a position at a distance of 0.1×n (mm) from a base end, the low hardness portion being a portion from a position at a distance of 0.1×(n+1) (mm) from the base end to the distal end, where “n” is a natural number. The low hardness portion includes a portion that has a largest curvature in the ground electrode. A highest hardness of the low hardness portion is lower than a lowest hardness of the high hardness portion. | 11-26-2015 |
| 20150357797 | SPARK PLUG - A spark plug is provided with: a central electrode; a ground electrode forming a spark discharge gap with the center electrode; and a chip welded to at least one of the electrodes. The chip has a thermal expansion coefficient smaller than a thermal expansion coefficient of the electrode to which the chip is welded, and the difference between the content A (mass %) of a noble metal component in the chip and the content B (mass %) of a noble metal component in the electrode (A−B) is 50 mass % or more. In an intermediate layer between the chip and the electrode, holes are present. When the length of a boundary between the chip and the intermediate layer is L (mm), and the length of the holes in a direction along the boundary of the chip and the intermediate layer is N (mm), 0.1≦N/L≦0.4. | 12-10-2015 |
| 20160105000 | SPARK PLUG - A spark plug with a center electrode, the center electrode having a small-diameter portion with a noble metal tip joined by laser welding to a front end of the small-diameter portion, a large-diameter portion made larger in diameter than the small-diameter portion and a connection portion connecting the small-diameter portion and the large-diameter portion to each other. In this spark plug, the following conditions (1), (2) and (3) are satisfied: | 04-14-2016 |
