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USPTO Patent Rankings Data through Sept 30, 2025
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Chen-Ching Chang

Overall (All Time): #1,635,816 of 4,157,543Top 40%
3 Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
5967537 Chainless transmission mechanism for a bicycle — 1999-10-19
5852948 Wheel hub and transmission gear arrangement of a chainless transmission mechanism for a bicycle — 1998-12-29
D401538 Chainless transmission unit of a bicycle — 1998-11-24

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