Ko-Yu Chang

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Taichung, TW

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Patents Grantslast 30 patents

Information Patent Grant
Crossbow with Belleville springs
- Patent number 10,627,186
- Issue date Apr 21, 2020
- Ko-Yu Chang
- F41 - WEAPONS
Information Patent Grant
Clamp
- Patent number 10,448,754
- Issue date Oct 22, 2019
- Door & Window Hardware Co.
- Wei-Hung Chang
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...

Patents Applicationslast 30 patents

Information Patent Application
ARCHERY DEVICE
- Publication number 20200408481
- Publication date Dec 31, 2020
- Ko-Yu CHANG
- F41 - WEAPONS
Information Patent Application
CROSSBOW
- Publication number 20200011632
- Publication date Jan 9, 2020
- Ko-Yu CHANG
- F41 - WEAPONS
Information Patent Application
Crossbow with Belleville Springs
- Publication number 20200011633
- Publication date Jan 9, 2020
- Ko-Yu CHANG
- F41 - WEAPONS