| Patents for H01T 21 - Apparatus or processes specially adapted for the manufacture or maintenance of spark gaps or sparking plugs (1,750) |
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| 07/14/1998 | US5779842 Forming an erosion resistant coating on an electrode |
| 05/28/1998 | WO1998023018A1 A transient voltage protection device and method of making same |
| 05/06/1998 | EP0750801B1 Spark plug with fine wire rivet firing tips and method for its manufacture |
| 04/21/1998 | US5741963 Adjustment method for spark plug and apparatus therefor |
| 04/15/1998 | CN1179024A Sparking plug and its producing method |
| 04/08/1998 | EP0834973A2 Spark plug and its manufacturing method |
| 04/07/1998 | US5736809 Laser welding, annealing to increase recrystallized grain size of noble metal layer |
| 03/18/1998 | EP0829936A1 Spark plug and producing thereof |
| 03/10/1998 | US5725405 Method and apparatus for positioning spark plug electrodes |
| 02/28/1998 | CA2214250A1 Device for cathodic cleaning of wire |
| 02/19/1998 | WO1998007220A1 Electrode for spark plugs of internal combustion engines and process for manufacturing the same |
| 02/19/1998 | DE19631985A1 Elektrode mit verschleißfester Beschichtung, Zündkerze und Verfahren zu ihrer Herstellung Electrode with a wear-resistant coating, the spark plug and method for their preparation |
| 02/11/1998 | CN1172901A Device for inspecting plug connection |
| 01/21/1998 | CN1171029A Surface discharge element and method of making the same |
| 01/21/1998 | CN1170980A Spark plug |
| 01/07/1998 | EP0817341A1 Spark plug |
| 01/07/1998 | EP0817334A2 Device for inspecting plug connection |
| 11/20/1997 | DE19719937A1 Motor vehicle IC engine sparking plug with manufacturing method |
| 11/11/1997 | US5687054 For use in an electrophotographic copy machine |
| 08/26/1997 | US5661262 Horn gap adjustment mechanism |
| 08/20/1997 | CN1157368A Diesel engine exhaust particle collection device |
| 08/05/1997 | US5655210 Corona source for producing corona discharge and fluid waste treatment with corona discharge |
| 07/30/1997 | CN1035535C New type spark plug and coating method |
| 07/22/1997 | US5649507 Vehicle spark plug system for operation from a vehicle battery |
| 07/01/1997 | US5642721 Double ignition system for internal combustion engines, ignition plug for double ignition systems, and electric spark generator |
| 05/02/1997 | EP0770766A1 A diesel engine exhaust particle collection device |
| 01/21/1997 | USRE35429 Spark plug and the method of manufacturing the same |
| 01/02/1997 | EP0750801A1 Spark plug with fine wire rivet firing tips and method for its manufacture |
| 11/26/1996 | US5578895 Spark plug having a noble metal electrode tip |
| 11/13/1996 | EP0741925A1 Erosion resistant coating on a spark plug electrode |
| 11/12/1996 | US5574329 Spark plug and a method of making the same for an internal combustion engine |
| 10/08/1996 | US5563468 Spark plug having arc-shaped precious metal chip and method of producing the same |
| 09/24/1996 | US5558575 Spark plug with platinum tip partially embedded in an electrode |
| 09/17/1996 | US5557158 Spark plug and method of producing the same |
| 09/17/1996 | US5556315 Method of making a spark plug for an internal combustion engine |
| 09/03/1996 | US5551902 Extrusion molded electrode formed as compound body and a method of producing the same |
| 08/27/1996 | US5549795 Vehicle ignition system |
| 07/03/1996 | EP0537156B1 Spark plug for internal combustion engine |
| 06/25/1996 | US5530313 Spark plug with copper cored ground electrode and a process of welding the electrode to a spark plug shell |
| 06/18/1996 | US5527198 High efficiency, extended life spark plug having shaped firing tips |
| 05/07/1996 | US5514314 Spark plug and method |
| 04/02/1996 | US5502994 Method for producing a metal tip |
| 03/05/1996 | US5497045 Spark plug having a noble metal electrode portion |
| 02/28/1996 | EP0698953A1 Corona source for producing corona discharge and fluid waste treatment with corona discharge |
| 02/07/1996 | EP0505368B1 Process for making electrodes for sparking plugs and sparking plug electrodes |
| 01/30/1996 | US5488262 Spark electrode having low thermal stress |
| 12/27/1995 | EP0491732B1 Forming an erosion resistant tip on an electrode |
| 12/26/1995 | US5478265 Spark plug and a method of making of same |
| 12/05/1995 | US5471759 Spark plug gauge with gap adjuster |
| 11/07/1995 | US5465022 Spark plug for internal-combustion engine and manufacture method of the same |
| 10/24/1995 | US5461276 Electrode for a spark plug in which a firing tip is laser welded to a front end thereof |
| 10/24/1995 | US5461275 Spark plug for use in an internal combustion engine |
| 10/24/1995 | US5461210 Method of manufacturing a spark plug electrode |
| 10/18/1995 | CN1110435A Technology and special equipment for making lightning arrester core body |
| 10/10/1995 | US5456624 Spark plug with fine wire rivet firing tips and method for its manufacture |
| 09/21/1995 | WO1995025372A1 Spark plug with fine wire rivet firing tips and method for its manufacture |
| 09/13/1995 | EP0671793A1 A spark plug for an internal combustion engine |
| 08/23/1995 | CN1107263A New type spark plug and coating method |
| 08/08/1995 | US5440198 Spark plug having a noble metal firing tip bonded to a front end of a center electrode |
| 07/27/1995 | WO1995020256A1 Erosion resistant coating on a spark plug electrode |
| 07/25/1995 | US5436608 Surge absorber |
| 05/10/1995 | CN1102512A Punched electrod composing combined body |
| 04/11/1995 | US5406166 Long life spark plug having consumable discharge member |
| 03/07/1995 | US5395273 Method of making a ground electrode for a spark plug |
| 02/01/1995 | EP0637113A1 A spark plug |
| 01/25/1995 | EP0635920A1 A spark plug for use in an internal combustion engine |
| 01/11/1995 | EP0633638A1 A spark plug for an internal combustion engine and a method of making the same |
| 01/04/1995 | CN1097083A Ceramic protection cover for spark plug and mfg. method thereof |
| 01/03/1995 | CA2035616C Apparatus and method for testing a telephone circuit protector |
| 12/21/1994 | EP0630086A1 Heater-equipped spark plug |
| 11/08/1994 | USRE34778 Spark plug and method of manufacturing the same |
| 10/06/1994 | DE4337928A1 Overvoltage protection and method for its production |
| 09/29/1994 | DE4409412A1 Zündkerze und Verfahren zu ihrer Herstellung Spark plug and method for their preparation |
| 09/28/1994 | EP0617492A1 Double ignition system for internal combustion engines, ignition plug for double ignition systems, and electric spark generator |
| 08/09/1994 | US5337035 Discharge tube |
| 06/14/1994 | US5320569 Method of making a spark plug |
| 06/01/1994 | CN1024876C Spark plug electrodes and process for making thereof |
| 05/11/1994 | WO1994010731A1 Tubular metal housing for spark plugs, heater plugs and sensors |
| 05/10/1994 | US5310373 Method for producing electrodes for spark plugs and spark plug electrodes |
| 05/05/1994 | DE4236656A1 Rohrförmiges Metallgehäuse für Zündkerzen, Glühkerzen und Sensoren A tubular metal housing for spark plugs, glow plugs and sensors |
| 05/04/1994 | CN1086162A Tubular metal housing for sparking plugs, glow plugs, and sensors |
| 03/23/1994 | EP0588495A1 A spark plug and a method of making the same |
| 03/16/1994 | EP0587446A1 A method of making spark plug electrode |
| 02/16/1994 | EP0583103A1 A method of making a spark plug |
| 02/16/1994 | EP0418281B1 Method for manufacturing electrodes for a spark plug |
| 12/29/1993 | CN2151555Y Spark plug cleaner |
| 12/28/1993 | US5273474 Method of manufacturing a center electrode for a spark plug |
| 12/22/1993 | EP0575163A1 A spark plug |
| 11/23/1993 | US5263886 Method for treating spark plugs |
| 10/28/1993 | DE4313619A1 Gas discharge tube for stable discharge - has sealed discharge chamber formed by cover bonded to cylindrical body with electrodes enclosed by inner wall surfaces of body and cover to protect from external electric fields. |
| 10/19/1993 | US5254954 Defect detecting apparatus and method for detecting a defect in an insulator using an electric discharge sense by an optical pickup |
| 09/08/1993 | CN2141943Y Repairable spark plug |
| 07/20/1993 | CA2020579C Method of manufacturing gas sealed discharge tube |
| 07/07/1993 | WO1993014544A1 Double ignition system for internal combustion engines, ignition plug for double ignition systems, and electric spark generator |
| 06/30/1993 | EP0549368A2 An electrode for a spark plug and a method of manufacturing the same |
| 06/16/1993 | EP0546562A2 Spark electrode and method of manufacturing same |
| 06/09/1993 | EP0545562A2 A method of manufacturing a centre electrode for a spark plug |
| 06/09/1993 | CN1073054A Regeneration technique for spark plug |
| 06/01/1993 | CA1318491C Method of moulding ceramic insulator in use for spark plug structure |
| 05/11/1993 | US5210458 Spark plug |