DBI CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6937159 Downhole telemetry and control system using orthogonal frequency division multiplexingExpiredFeb 01, 02Aug 30, 05[G01V]
6898149 Reprogrammable downhole telemetry and control systemExpiredFeb 01, 02May 24, 05[G01V]
6747569 Downhole telemetry and control systemExpiredFeb 01, 02Jun 08, 04[G01V]
5448593 Frequency hopping time-diversity communications systems and transceivers for local area networksExpiredJul 24, 92Sep 05, 95[H04L, H04B]
5257090 Laser diode liquid-level/distance measurementExpiredNov 27, 91Oct 26, 93[G01B]
5245335 Transceiver system for communication over wire laid along the path of guided/vehiclesExpiredMay 28, 91Sep 14, 93[B62D]
5168510 Spread spectrum-time diversity communications systems and transceivers for multidrop area networksExpiredApr 05, 89Dec 01, 92[H04L, H04B]
4597082 Transceiver for multi-drop local area networksExpiredMar 06, 84Jun 24, 86[H04L, G08C, G06F]

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