Primo Microphones, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5751827 Piezoelectric speakerExpiredMar 13, 95May 12, 98[H04R]
5243415 Limited range stereo-audio video RF transmitter to multiple receiver systemExpiredApr 05, 91Sep 07, 93[H04N, H04B]
5146490 Passive telephone line monitoring systemExpiredMay 31, 91Sep 08, 92[H04M]
5031872 Microphone noise frequency and vibration absorbing mountExpiredAug 01, 90Jul 16, 91[F16M]

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