TBS INTERNATIONAL, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4599493 Multi-line telephone control systemExpiredAug 28, 84Jul 08, 86[H04M]
4405833 Telephone call progress tone and answer identification circuitExpiredJun 17, 81Sep 20, 83[H04M]
4340913 Tri-level digital recordingExpiredJan 15, 81Jul 20, 82[G11B]
4333056 Automatic gain control circuit with non-negative exponential releaseExpiredApr 07, 80Jun 01, 82[H03G]

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