Growing community of inventors

Pacifica, CA, United States of America

Charles Quach

Average Co-Inventor Count = 3.00

ph-index = 2

The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.

Forward Citations = 38

Charles QuachLoc Duc Nguyen (2 patents)Charles QuachChris S Nelson (2 patents)Charles QuachCharles Quach (2 patents)Loc Duc NguyenLoc Duc Nguyen (26 patents)Chris S NelsonChris S Nelson (7 patents)
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Inventor’s number of patents
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Strength of working relationships

Company Filing History:

1. Visa International Service Association (2 from 2,532 patents)


2 patents:

1. 8707319 - Resource location verification by comparing and updating resource location with a location of a consumer device after a threshold of location mismatches is exceeded

2. 8600881 - System and method for uniquely identifying point of sale devices in an open payment network

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as of
1/20/2026
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