| 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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| 11/12/1985 | US4553063 Electrical discharge electrode and method of production thereof |
| 07/02/1985 | US4526551 Production of electrodes |
| 06/11/1985 | CA1188651A1 Electrode coating process |
| 05/28/1985 | US4519784 Method of inserting a center electrode in a spark plug insulator |
| 03/12/1985 | CA1183802A1 Process for improving electrode coatings |
| 02/05/1985 | US4497633 Method of forming a tubular electrical insulator assembly |
| 12/25/1984 | US4490122 Process for manufacturing an ignition device for an internal combustion engine, and ignition device obtained thereby |
| 11/27/1984 | CA1178653A1 Method for producing a composite center electrode and an electrode |
| 08/14/1984 | US4465916 Method for manufacturing a plasma ignition device for an internal combustion engine |
| 06/19/1984 | CA1169237A1 Production of electrodes |
| 03/20/1984 | US4437845 Method for manufacturing a gas-filled discharge tube for use as transient protection |
| 12/13/1983 | CA1158500A1 Igniter plug |
| 12/13/1983 | CA1158499A1 Igniter plug |
| 11/08/1983 | US4414483 Spark plug and manufacturing process thereof |
| 10/18/1983 | US4410309 Method of making a spark-plug center electrode |
| 10/04/1983 | US4407849 Process for improving electrode coatings |
| 09/27/1983 | US4406968 Sparkplug for internal combustion engine |
| 09/13/1983 | US4404234 Electrode coating process |
| 07/12/1983 | US4393324 Spark plug with a sphere-like metal center electrode and manufacturing process thereof |
| 05/17/1983 | US4383723 Procedure for manufacturing gas-filled discharge devices |
| 03/16/1983 | EP0073939A1 High-tension spark plug |
| 02/09/1983 | EP0071577A1 Spark plug |
| 01/05/1983 | EP0069052A1 Method of manufacturing an ignition device for an internal-combustion engine |
| 01/04/1983 | CA1138626A1 Manufacture of bi-metal electrodes for spark plugs |
| 10/05/1982 | US4352283 Method of forming spark plug bodies |
| 09/28/1982 | US4351095 Method of making spark plugs |
| 06/23/1982 | EP0054374A2 Spark plug electrode and its method of manufacture |
| 04/14/1982 | EP0049372A1 Spark plug for internal-combustion engines |
| 02/09/1982 | US4315298 Igniter plug |
| 02/09/1982 | US4314392 Method of making a spark plug electrode |
| 01/27/1982 | EP0044764A1 Method for manufacturing a center electrode for use in a spark plug |
| 01/05/1982 | US4309738 Igniter plug |
| 12/09/1981 | EP0041475A1 Method of manufacturing an ignition device for an internal-combustion engine, and ignition device obtained thereby |
| 09/23/1981 | EP0036050A1 Method of forming spark plug bodies |
| 08/11/1981 | US4283747 Methods of making a gas tube surge protector |
| 09/09/1980 | CA1085450A1 Voltage surge protector |
| 04/15/1980 | CA1075763A1 Igniting electrodes |
| 02/26/1980 | CA1072339A1 Spark plug cleaner |
| 01/08/1980 | US4182009 Electrical igniters |
| 11/20/1979 | US4175277 Voltage surge protector |
| 01/23/1979 | US4136259 Igniting electrodes and method for making same |
| 10/17/1978 | CA1040399A1 Installation for hot crimping on a production line_ |
| 07/04/1978 | US4097977 Method to attach the center electrode into a ceramic insulator body of spark plugs |
| 01/31/1978 | US4070740 Continuous production hot-setting installation |
| 12/13/1977 | US4062155 Spark plug cleaner |
| 11/08/1977 | US4057702 Process and plant for the fritting of ceramic products |
| 06/14/1977 | US4028851 Sparkplug cleaner |
| 11/09/1976 | US3990389 Coating apparatus |
| 06/29/1976 | US3967230 Resistor built-in spark plug |
| 05/18/1976 | US3958144 Spark plug |