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| US4099037 | 21. Juni 1976 | 4. Juli 1978 | National Semiconductor Corporation | Key board switch assembly having canti-levered leaf spring contact assembly on common conductive frame |
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Sony Electronics, Inc. | Multi-directional button assembly with center and peripheral arranged buttons and microswitches |
| US6572389 | 14. Dez. 2000 | 3. Juni 2003 | Intel Corporation | Contact elements for surface mounting of burn-in socket |
| US6655969 | 25. Febr. 2003 | 2. Dez. 2003 | Intel Corporation | Contact elements |
| US7851718 | 25. März 2008 | 14. Dez. 2010 | Panasonic Corporation | Electronic equipment |
