Growing community of inventors

Richmond, TX, United States of America

David A Walker

Average Co-Inventor Count = 5.00

ph-index = 5

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 = 342

David A WalkerCassandra J Mollett (6 patents)David A WalkerDavid Wayne Smith (6 patents)David A WalkerAlan Jay Bethscheider (6 patents)David A WalkerSusan Diane Brauckman (6 patents)David A WalkerDavid A Walker (6 patents)Cassandra J MollettCassandra J Mollett (27 patents)David Wayne SmithDavid Wayne Smith (10 patents)Alan Jay BethscheiderAlan Jay Bethscheider (6 patents)Susan Diane BrauckmanSusan Diane Brauckman (6 patents)
..
Inventor’s number of patents
..
Strength of working relationships

Company Filing History:

1. First Data Corporation (6 from 568 patents)


6 patents:

1. 8473351 - Systems and methods for verifying authorization

2. 7769638 - Systems and methods for verifying authorization for electronic commerce

3. 7191941 - Systems and methods for determining a need for authorization

4. 7182255 - Systems and methods for determining an authorization

5. 6935559 - Systems and methods for determining an authorization threshold

6. 6755344 - Systems and methods for determining an authorization threshold

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as of
12/30/2025
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