Broadcast Technology Partners

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4817151 Selective decoder for compatible FM stereophonic system utilizing companding of difference signalExpiredNov 09, 87Mar 28, 89[H04H]
4771464 FM stereophonic broadcasting system utilizing simultaneous companding and modulation/demodulationExpiredMay 08, 87Sep 13, 88[H04H]
4769841 Receiver for compatible FM stereophonic system utilizing companding of difference signalExpiredJul 09, 87Sep 06, 88[H04H]
4752955 FM stereophonic system having improved compatibility in presence of multipathExpiredMar 25, 87Jun 21, 88[H04H]
4751734 Receiver for FM stereophonic broadcasting system utilizing circuits for reducing effects of multipathExpiredJun 01, 87Jun 14, 88[H04H]
4602380 Compatible transmission techniques for FM stereophonic radio and televisionExpiredJan 04, 85Jul 22, 86[H04H]
4602381 Adaptive expanders for FM stereophonic broadcasting system utilizing companding of difference signalExpiredJan 04, 85Jul 22, 86[H04H]
4485483 FM Stereophonic system incorporating companding of difference signalExpiredMar 18, 83Nov 27, 84[H04H]

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