Panafacom Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4896257 Computer system having virtual memory configuration with second computer for virtual addressing with translation error processingExpiredNov 23, 88Jan 23, 90[G06F]
4849747 Display data transfer control apparatus applicable for display unitExpiredNov 07, 86Jul 18, 89[G09G]
4837564 Display control apparatus employing bit map methodExpiredNov 07, 86Jun 06, 89[G09G]
4827251 Display control system with control of background luminance or color dataExpiredJan 29, 87May 02, 89[G09G]
4803618 Multiprocessor system having common memoryExpiredJan 17, 86Feb 07, 89[G06F]
4801930 Video information transfer processing systemExpiredNov 07, 86Jan 31, 89[G09G]
4788655 Condition code producing systemExpiredJun 16, 86Nov 29, 88[G06F]
4701846 Computer system capable of interruption using special protection code for write interruption region of memory deviceExpiredJan 17, 86Oct 20, 87[G06F]
4644419 Floppy disk unitExpiredApr 30, 86Feb 17, 87[G11B]
4602330 Data processorExpiredDec 28, 84Jul 22, 86[G06F]
D280900 PrinterExpiredJan 21, 83Oct 08, 85[]
D279187 ComputerExpiredJan 24, 83Jun 11, 85[]
D279189 DisplayExpiredJan 21, 83Jun 11, 85[]
D279190 KeyboardExpiredJan 21, 83Jun 11, 85[]
4471425 A data transfer control system for multiple units on a common bus using a serially transmitted transfer permission signalExpiredFeb 22, 81Sep 11, 84[G06F]
4384342 System for reducing access time to plural memory modules using five present-fetch and one prefetch address registersExpiredOct 29, 80May 17, 83[G06F]
4334269 Data processing system having an integrated stack and register machine architectureExpiredNov 09, 79Jun 08, 82[G06F]
4271466 Direct memory access control system with byte/word control of data busExpiredNov 21, 78Jun 02, 81[G06F]

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