Inventor
HU SHIOU-HUA
US4 patents
Patents
4 patentsUS9497425B2Nov 15, 2016
Motion detection method and device using the same
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Video doorbell system compatible with various accessories
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US9521377B2Dec 13, 2016
Motion detection method and device using the same
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US10257473B2Apr 9, 2019
Doorbell device and method thereof
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