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For the Inventor, By the Inventor

Tempe, AZ, United States of America

Progressive Language, Inc.


USPTO Granted Patents = 1

% Expired Patents = 100.0

Forward Citations = 2

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1 inventor (with patents filed for the assignee):

goldMedal Timothy Keller (1 out of 4 patents)


1 patent:

1. 8272873 - Language learning system (2012-09-25),
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USPTO Data Jan 1 1976 - Sep 15 2026

1 Patents

#214 in Tempe, AZ

#1,975 in Arizona

#136,534 in US

Tempe, AZ (US)
Tempe, AZ, United States of America

Progressive Language, Inc.

Forward Citations = 2

1 inventor:

goldMedal Timothy Keller (1 out of 4 patents)

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