| Patents for H01T 13 - Sparking plugs (7,441) |
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| 02/06/1992 | DE4031542C1 Sparking plugs contact plate fixed to cylinder head - prevents sticking by springs tending to push cover off |
| 01/29/1992 | EP0468572A1 Low radio interference spark plug |
| 01/29/1992 | EP0468253A2 Diagnostic device for gas turbine ignition system |
| 01/28/1992 | US5083932 Igniter cable connector seal |
| 01/14/1992 | US5080083 Discharge device and ignition system with series gap using discharge device |
| 01/09/1992 | WO1992000620A1 Sparking plug |
| 01/08/1992 | EP0464353A1 Spark plug |
| 01/08/1992 | EP0174346B1 Combustion initiation system employing hard discharge ignition |
| 01/08/1992 | CN2092822U Sparking plug cap with eye split |
| 12/31/1991 | US5076223 Miniature railgun engine ignitor |
| 12/24/1991 | US5074262 Spark device for internal combustion engines |
| 12/17/1991 | US5073741 Igniter plug |
| 11/27/1991 | EP0458375A1 Spark plug assembly for internal combustion engine |
| 11/13/1991 | EP0455629A1 Optical transmitter for producing an optical signal indicative of temperature. |
| 11/06/1991 | EP0455256A2 Glowplug |
| 11/06/1991 | CN1056022A Full-glass spark plug resisting carbon deposit |
| 11/05/1991 | US5063012 Method of manufacturing elastomeric engine components |
| 10/30/1991 | EP0454598A1 Integrated unit comprising an ignition coil and a plug for the individual controlled ignition in an internal combustion engine |
| 10/30/1991 | EP0454203A1 Internal combustion engine having a permanent ground electrode and replaceable centre electrode element |
| 10/30/1991 | CN1014573B Ignition plug for use in internal combustion engines and ignition process by using same |
| 10/29/1991 | US5060625 Ignition system wiring harness and spring clip retainers therefor |
| 10/29/1991 | US5060624 Engine ignition system including a transformer assembly and positioning means therefor |
| 10/26/1991 | CA2031815A1 Spark plug assembly for internal combustion engine |
| 10/26/1991 | CA2030721A1 Internal combustion engine having a permanent ground electrode and replaceable center electrode element |
| 10/24/1991 | DE4012386A1 Controlling safety equipment for driver and/or passengers - measuring voltage of oscillating circuit and rectifying for comparison with stipulated voltage value |
| 10/23/1991 | EP0453277A1 Spark plug |
| 10/23/1991 | EP0452645A1 Electrically heatable ignition electrode device |
| 10/23/1991 | EP0407397B1 Pressure transducer for determining the pressure in the combustion chamber of an internal combustion engine |
| 10/17/1991 | WO1991015887A1 Spark plug for internal combustion engine |
| 10/17/1991 | WO1991015677A1 Miniature railgun engine ignitor |
| 10/17/1991 | DE4011630A1 Spark plug for IC engine - has central carrier supporting angularly spaced electrode pins providing respective spark gaps |
| 10/16/1991 | EP0451264A1 Spark plug with a ring/open-ring shaped ground electrode. |
| 10/16/1991 | EP0311608B1 Spark plug with surface discharge section |
| 10/08/1991 | US5055772 High voltage ignition system monitor for spark initiated internal combustion engines |
| 09/26/1991 | DE4009145A1 Capacitor discharge ignition circuit for IC engine - transfers stored magnetic energy from ignition coil to capacitor recharged through prim. winding during intervals between sparks |
| 09/25/1991 | EP0447659A1 Spark plug connector |
| 09/24/1991 | US5051651 Ignition plug with a hollow cylindrical ground electrode and an ignition process by the use thereof |
| 09/11/1991 | EP0445557A1 Ignition coil for internal combustion engine |
| 09/11/1991 | EP0445283A1 Combustion ignitor. |
| 09/11/1991 | CN1054508A Compound technology of ni-cu material manufacture of ni-cu electrode for spark plug |
| 09/10/1991 | US5046466 Spark-ignition engine |
| 09/10/1991 | US5046464 Clamp for ignition cables |
| 09/03/1991 | US5044349 High-voltage switch |
| 09/03/1991 | US5044331 Air-fuel ratio control method for an internal combustion engine having spark plugs with heaters |
| 08/22/1991 | DE4104622A1 IC engine spark plug fitting socket - has socket sleeve with hooks at ends of axial slots engaging spark plug projections |
| 08/14/1991 | EP0441157A2 Spark plug with pressure detector |
| 08/07/1991 | EP0439832A1 Ignition device for combustion engines |
| 07/23/1991 | US5033982 Electrical connector |
| 07/03/1991 | EP0435202A2 Spark plug for internal combustion engine |
| 06/27/1991 | WO1991009438A1 Process for making electrodes for sparking plugs and sparking plug electrodes |
| 06/26/1991 | EP0433870A1 High tension cable device |
| 06/26/1991 | CN1052577A Spark plug electrodes and process for making thereof |
| 06/25/1991 | US5026294 Ignition plug socket structure |
| 06/21/1991 | CA2032411A1 High tension cable device |
| 06/20/1991 | DE4017650A1 Sparking plug with air-gap around metallic sleeve - which has thermal conductance greater than 10 to the power minus 4 Joule-metre per deg. Kelvin per second |
| 06/20/1991 | DE3941649A1 Verfahren zur herstellung von elektroden fuer zuendkerzen sowie zuendkerzen-elektroden Process for the manufacture of electrodes for spark plugs and spark plug |
| 06/13/1991 | WO1991008603A1 Improved spark plug |
| 06/06/1991 | DE4017649A1 High performance spark plug - has insulating body inside earthed conductor acting as low loss waveguide |
| 06/05/1991 | EP0430899A1 A spark plug, particularly for supercharged and racing engines |
| 06/05/1991 | EP0430775A1 Fastening of a compound ignition coil and-plug in the cylinder head of an engine |
| 05/29/1991 | EP0429407A1 A spark plug for motor vehicles |
| 05/21/1991 | US5017826 Rapid heat-dissipating type spark plug for internal combustion engines |
| 05/14/1991 | US5014656 Internal combustion engine having a permanent ground electrode and replaceable center electrode element |
| 05/08/1991 | CN2076720U Combined spark plug |
| 04/25/1991 | DE3935174A1 Long-life sparking plug with radially asymmetric gaps - has earthed electrodes of rectangular section bent towards centre with angular deviation of up to 10 deg. |
| 04/25/1991 | DE3935165A1 Sparking plug with earthed electrodes curved towards centre - so that movement of combustible mixt. prolongs spark migrating towards region where inter electrode distance is greater |
| 04/18/1991 | WO1991005389A1 Arrangement for improving starting behaviour |
| 04/18/1991 | WO1991005388A1 Combustion ignitor |
| 04/17/1991 | EP0353222B1 Ignition device with lowered ignition temperature |
| 04/17/1991 | CN2075390U Engine oil resisting sparking-plug |
| 04/16/1991 | US5008584 Resistor is sintered mixture of glass particles, ceramic particles and carbon black |
| 04/16/1991 | US5007389 Ignition plug for internal combustion engines and a process for igniting gas mixture by the use thereof |
| 04/14/1991 | WO1991006142A1 Spark plug with a ring/open-ring shaped ground electrode |
| 03/27/1991 | EP0418307A1 Method for manufacturing electrodes for a spark plug |
| 03/27/1991 | EP0418284A1 Spark plug. |
| 03/26/1991 | CA1281953C Plug cap apparatus |
| 03/20/1991 | EP0418055A1 Spark plug |
| 03/20/1991 | EP0417938A2 Apparatus for torch jet-assisted spark ignition |
| 03/13/1991 | CN2073177U Double-metal central electrode |
| 03/13/1991 | CN2073176U Fire injection chamber type spark plug |
| 03/12/1991 | US4999137 Semi-conductive ceramic composition and its use in the manufacture of spark plugs |
| 03/05/1991 | US4997380 Electrical connector for connecting a cable, in particular an ignition lead, to a terminal |
| 02/13/1991 | EP0412576A2 Apparatus for igniting the combustion of a fuel-air mixture |
| 02/13/1991 | CN2071395U Carbon built-up proof spark plug |
| 02/05/1991 | US4989575 Ignition device for internal combustion engine |
| 02/05/1991 | US4989557 Spark plug assembly for internal combustion engine |
| 01/31/1991 | DE3925221A1 Monitoring ignition path in motor vehicle - integrating signal derived from voltage on path and registering fault if set valve is not attained |
| 01/29/1991 | US4987868 Spark plug having an encapsulated center firing electrode gap |
| 01/16/1991 | EP0408089A2 Apparatus for initiating combustion of fuel-air mixtures in an internal combustion engine |
| 01/16/1991 | EP0407986A2 High tension cable device and process of producing the same |
| 01/16/1991 | EP0407976A1 Discharge device and ignition system with series gap using discharge device |
| 01/16/1991 | EP0407975A2 Gas-filled discharge tube and high tension cable device |
| 01/16/1991 | EP0407397A1 Pressure transducer for determining the pressure in the combustion chamber of an internal combustion engine. |
| 01/15/1991 | US4984905 Temperature and pressure detecting type spark plug |
| 01/10/1991 | WO1991000680A1 Methods for generating plasma and producing ozone |
| 01/10/1991 | DE3920080A1 Ignition system for IC engine - assigns own ignition unit to each spark plug with MV outlet connected to plug sleeve pushed on centre electrode |
| 01/09/1991 | EP0406509A1 Method for making insulated conductor elements for connecting units to signal generators |
| 01/08/1991 | US4983882 Ignition amplifier device |
| 01/08/1991 | US4983877 Ignition plug for use in internal combustion engines to cause instantaneous combustion |
| 01/02/1991 | CN2068728U Three-sparks spark plug |