|
| US4235214 | 13. Juli 1978 | 25. Nov. 1980 | Kabushiki Kaisha IDK | Secondary air guide ring for ignition plug |
| US4326145 | 28. Jan. 1980 | 20. Apr. 1982 | The Toro Company | Compression relief adapter |
| US4469059 | 16. Apr. 1982 | 4. Sept. 1984 | | Spark plug |
| US4823746 | 25. Sept. 1987 | 25. Apr. 1989 | | Engine ignitor with integral compression release valve |
| US4859900 | 6. Mai 1988 | 22. Aug. 1989 | | Ignition plug for improving fuel economy of an internal combustion engine and decreasing the amount of toxicants expelled to the environment |
| US5787857 | 13. Dez. 1995 | 4. Aug. 1998 | | Fuel injected internal combustion engine |
| US5799634 | 3. März 1997 | 1. Sept. 1998 | | Spark plug for venting excessive pressure |
| US5873340 | 21. Nov. 1997 | 23. Febr. 1999 | | Spark plug for venting excessive pressure |
| US5937813 | 29. Apr. 1998 | 17. Aug. 1999 | | Resettable pressure relieving spark plug |
| US5955826 | 26. Jan. 1994 | 21. Sept. 1999 | NGK Spark Plug Co., Ltd. | Spark plug with built-in pressure sensor |
| USD494136 | 17. Juli 2003 | 10. Aug. 2004 | | Spark plug |