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For the Inventor, By the Inventor

Hong Kong, China

Varitronix Limited


USPTO Granted Patents = 1

Forward Citations = 49

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2 inventors (with patents filed for the assignee):

goldMedal York Liao (1 out of 4 patents)

silverMedal Michael Y Chan (1 out of 1 patent)


1 patent:

1. 5499026 - Conductive touch pad with capacitive blocking filter (1996-03-12),
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USPTO Data Jan 1 1976 - Sep 29 2026

1 Patents

#1,834 in Hong Kong

#18,586 in China

Hong Kong, CN
Hong Kong, China

Varitronix Limited

Forward Citations = 49

2 inventors:

goldMedal York Liao (1 out of 4 patents)

silverMedal Michael Y Chan (1 out of 1 patent)

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