ECRM TRUST

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4751524 Constant power laser driverExpiredJan 20, 87Jun 14, 88[H01S, G01D]
4683187 Dry process electrostatic developer comprising a generally round magnetic carrier and a flake-type carrierExpiredAug 09, 85Jul 28, 87[G03G]
4613877 High resolution laser printerExpiredNov 26, 84Sep 23, 86[G01D]
4578689 Dual mode laser printerExpiredNov 26, 84Mar 25, 86[G01D]
4360840 Real time data compression/decompression scheme for facsimile transmission systemExpiredMay 13, 80Nov 23, 82[H04N]
4352012 Header sheet for image communications systemExpiredFeb 22, 80Sep 28, 82[G06R]

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