David Chang

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Automatic gearshifting device of multi-stage fly wheel of bicycl

Endless belt power transmission systems or components – Control for variable input to output speed-ratio – Including belt shiftable axially from one to another surface...
Patent

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Bicycle rear-wheel hub assembly

Endless belt power transmission systems or components – Positive drive pulley or guide roll – And additional coaxial surface for engaging same belt in...
Patent

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CD frame

Furnishings – Furniture – freestanding support – or frame therefor – Work surface – storage – merchandising or display unit
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Computer graphic drawing apparatus with coarse and fine controls

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
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Computer table

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Profile ID: LFUS-PAI-P-152545

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