Direct memory access controlled system
CA 1306071 C · Owner: Tanikawa, Akinao · Inventors: Sakai, Toshihiro; Tanikawa, Akinao; Ohshima, Toshiharu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A direct memory access (DMA) controlled system which performs DMA data transfer between a main memory a cache memory, and disk memories while exchanging DMA transfer requests and acknowledgements among disk control units, memory-to-memory transfer control unit and a common DMA control unit. The data transfer speed between the main memory and cache memory is variable according to the load condition of the DMA control unit for the disk memories, enabling the transfer capability of the DMA control unit to be kept at a fixed continually high level.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted August 4, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.