Direct access storage device with independently stored parity
CA 2070820 A1 · Owner: Storage Technology Corporation · Inventors: Manka, Paul Stanley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A failure independent fault tolerant Direct Access Storage, Device (DASD) storage subsystem including a Disk Control Unit (106) and a number of Physical Devices (211, 212) is provided with a parity Generator (303) for generating a parity for system records as the system records are transferred between the storage subsystem and a CPU (101) of a data processing system. The parity is stored on a different unit so that if one unit containing portions of a system record becomes unavailable, the unavailable portion of the record is reconstructed during transfer to the CPU from the remainder of the record and the parity. The storage system of the invention can accommodate variable length data …
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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 December 5, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 5, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 5, 2012.
- 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.