Inventor
CHEN XUEYIN
US9 patents
Patents
9 patentsUS10219111B1Feb 26, 2019
Visitation tracking system
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US10681491B1Jun 9, 2020
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US11297463B2Apr 5, 2022
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US10924886B2Feb 16, 2021
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US10779114B2Sep 15, 2020
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US10448199B1Oct 15, 2019
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US12035198B2Jul 9, 2024
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US11683657B2Jun 20, 2023
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US12342241B2Jun 24, 2025
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