Information processing system
CA 2117391 C · Owner: International Business Machines Corporation · Inventors: Kawamura, Tateo; Shimotono, Susumu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the process of returning to a series of processes for returning to a normal operation mode, an I/O address showing a change line status register of the FDC is set to a stored register of the trap logic. When the process returns to the normal operation mode and then an access to the first status register is trapped a change, line status flag value is rewritten. The faked OS/driver invalidates the floppy disk allocation information in the main memory.
Read the whole patent
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 July 7, 1994 and granted August 18, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 7, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 7, 2016.
- 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.