IBM PRODUCTS ASIA PTE. LTD.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5892953 Corrective service facilityExpiredMar 25, 97Apr 06, 99[G06F]
5873129 Method and apparatus for extending physical system addressable memoryExpiredFeb 28, 94Feb 16, 99[G06F]
5678023 Method and apparatus for directly and automatically accessing a bank of data storage devices with a computerExpiredSep 19, 94Oct 14, 97[G06F]
5659773 Personal computer with input/output subsystemExpiredNov 14, 90Aug 19, 97[G06F]
5459842 System for combining data from multiple CPU write requests via buffers and using read-modify-write operation to write the combined data to the memoryExpiredJun 26, 92Oct 17, 95[G06F]
5381538 DMA controller including a FIFO register and a residual register for data buffering and having different operating modesExpiredOct 15, 91Jan 10, 95[G06F]
5379400 Method and system for determining memory refresh rateExpiredAug 07, 92Jan 03, 95[G11C]
5293590 Personal computer with interface controllerExpiredApr 06, 92Mar 08, 94[G06F]
5007085 Remotely sensed personal stylusExpiredOct 28, 88Apr 09, 91[H04L]

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