Tsai, Hung-Cheng
Patent Applications and Registrations
Patent applications and USPTO patent grants for Tsai, Hung-Cheng.The latest application filed is for "alarm device for pickproofing a lock member".
- Tsai, Hung-Cheng - Chia-Yi City TW
- Tsai; Hung-Cheng - Chia-Yi TW
| Patent | Date |
|---|---|
| Alarm device for pickproofing a lock member App 20050179556 - Tsai, Hung-Cheng | 2005-08-18 |
| Door lock App 20050156441 - Tsai, Hung-Cheng | 2005-07-21 |
| Electric door lock with a coupling mechanism for selective engagement between a deadbolt operating spindle and a door handle Grant 6,807,834 - Tsai October 26, 2 | 2004-10-26 |
| Electric door lock with a coupling mechanism for selective engagement between a deadbolt operating spindle and a door handle App 20040177660 - Tsai, Hung-Cheng | 2004-09-16 |
| Electric padlock Grant 6,761,051 - Tsai July 13, 2 | 2004-07-13 |
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