| Patents for H01T 11 - Spark gaps specially adapted as rectifiers (4) | |
|---|---|
| 09/2009 | |
| 09/01/2009 | US7581304 Method of forming a spark plug with multi-layer firing tip |
| 01/2003 | |
| 01/29/2003 | CN2533596Y Voltage controlled switch |
| 03/2002 | |
| 03/13/2002 | CN2482095Y Zinc oxide lightning arrester state indicator |
| 10/1991 | |
| 10/10/1991 | DE4010909A1 Cold-emission protection diode - has air-isolated electrodes with micrometric separation to prevent electrical discharge |