National Information Utilities Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4768087 Education utilityExpiredJun 06, 85Aug 30, 88[H04N]
4646290 Data transmission method and apparatusExpiredAug 03, 84Feb 24, 87[H04J]
4558454 Digital partial response filterExpiredApr 11, 83Dec 10, 85[H04L]

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