For the Inventor, By the Inventor

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Tempe, AZ, United States of America

Progressive Language, Inc.

USPTO Granted Patents = 1

Forward Citations = 2

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1 inventor (with patents filed for the assignee):

Timothy Keller (1 out of 4 patents)

1 patent: Sort by Forward Citations

1. 8272873 - Language learning system (2012-09-25),

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USPTO Data Jan 1 1976 - Jan 6 2026

1 Patents

#215 in Tempe, AZ

#1,932 in Arizona

#133,943 in US

Tempe, AZ, United States of America

Progressive Language, Inc.

Forward Citations = 2

1 inventor:

Timothy Keller (1 out of 4 patents)

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