System bus control system in a multi-processor system
CA 2228342 C · Owner: Fujitsu Limited · Inventors: Tanihira, Hisamitsu; Shibata, Yuji; Okazaki, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The first invention relates to a multi-processor system in which a bus arbiter permits an answer transfer request to utilize a bus utilization right with higher priority than a command transfer request thereby increasing the processing efficiency of CPU boards. The second invention relates to a multi-processor system utilizing a system bus of a time split transfer system in which a data width of its own unit is inserted into a command and an answer transmitted and received between the processors and transmitted as bus width information, thus making it possible to interconnect a unit, which processes data of an arbitrary data width, to the system bus. In accordance with the third invention, …
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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
- Filed March 4, 1991 and granted September 3, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 2013.
- 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.