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For the Inventor, By the Inventor

Baltimore, MD, United States of America

World Class Learning Materials, Inc.


USPTO Granted Patents = 2

% Expired Patents = 100.0

Trademarks = 2

Forward Citations = 13

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2 inventors (with patents filed for the assignee):

goldMedal Pui Yan Chan (2 out of 2 patents)

silverMedal Bruce Brown (2 out of 13 patents)


2 patents:

1. 7236430 - Apparatus, method and system for teaching elapsed time (2007-06-26),
2. 7121833 - Apparatus, method and system for teaching elapsed time (2006-10-17),
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USPTO Data Jan 1 1976 - Sep 22 2026

2 Patents

#200 in Baltimore, MD

#1,420 in Maryland

#94,667 in US

Baltimore, MD (US)
Baltimore, MD, United States of America

World Class Learning Materials, Inc.

Forward Citations = 13

2 inventors:

goldMedal Pui Yan Chan (2 out of 2 patents)

silverMedal Bruce Brown (2 out of 13 patents)

Please report any incorrect information to [email protected]
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