Chang; Chi-Tsan
Patent Applications and Registrations
Patent applications and USPTO patent grants for Chang; Chi-Tsan.The latest application filed is for "headphone".
- Chang; Chi-Tsan - Taipei TW
- Chang; Chi-Tsan - Taipei City TW
- Chang; Chi-Tsan - Peitou Dist. Taipei City TW
| Patent | Date |
|---|---|
| Headphone Grant 8,098,872 - Chang January 17, 2 | 2012-01-17 |
| Headphone App 20110007928 - Chang; Chi-Tsan | 2011-01-13 |
| Sound-box type earphone housing, headset with sound-box type earphone housings Grant 7,869,615 - Chang January 11, 2 | 2011-01-11 |
| Sound-box type earphone housing, headset with sound-box type earphone housings App 20080075314 - Chang; Chi-Tsan | 2008-03-27 |
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