R. D. Percy & Company

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4769697 Passive television audience measuring systemsExpiredDec 17, 86Sep 06, 88[H04N, H04H]
4646145 Television viewer reaction determining systemsExpiredApr 07, 80Feb 24, 87[H04N]
4308554 Television viewer reaction determining systemExpiredMar 27, 78Dec 29, 81[H04M]

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