Aurora, IL, United States of America

National Seal Company


USPTO Granted Patents = 2

Forward Citations = 6

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3 inventors (with patents filed for the assignee):

goldMedal Thaddeus S Dzierzbicki (1 out of 3 patents)

silverMedal Leslie C Hardison (1 out of 22 patents)

bronzeMedal Kenneth A Sandstrom (1 out of 1 patent)


2 patents:

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USPTO Data Jan 1 1976 - Dec 9 2025

2 Patents

#51 in Aurora, IL

#4,307 in Illinois

#92,600 in US

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Aurora, IL, United States of America
Forward Citations = 6

3 inventors:

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