Extel Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4850008 Method and apparatus for discrimination between different kinds of data transmissionExpiredFeb 29, 88Jul 18, 89[H04Q]
4839802 Adaptation of computer to communication operationExpiredNov 19, 86Jun 13, 89[G06F]
4392754 Magnetic dot matrix printing method and apparatusExpiredFeb 10, 82Jul 12, 83[B41J]
4392755 Magnetic dot matrix printingExpiredFeb 10, 82Jul 12, 83[B41J]
4363461 Tape reader motor mountExpiredSep 02, 80Dec 14, 82[F16M]
4346854 Printer paper take-up and storage deviceExpiredOct 24, 80Aug 31, 82[B65H]
4298786 Thin film thermal print headExpiredOct 01, 79Nov 03, 81[H05B]
4242004 Dot matrix printhead driverExpiredMar 21, 79Dec 30, 80[B41J]
4206541 Method of manufacturing thin film thermal print headsExpiredJun 26, 78Jun 10, 80[H05B]

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