Method of end to end verification of primary and secondary data base in a process control system
CA 2051741 C · Owner: Mclaughlin, Paul F. · Inventors: Bristow, Robert W.; Mclaughlin, Paul F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Data bases of a first and second input output processor (IOP), which are primary and secondary slave IOPs, respectively, are synchronized, and communications by a master controller is made only to the first IOP. Each IOP is executing the same tasks utilizing their own clocking systems. A method for periodically verifying that the first and second data base remain synchronized comprises the steps of sending a sync-verify type message to the first IOP. The second IOP eavesdrops on the communications, and when the second IOP recognizes that the message is addressed to the corresponding primary slave IOP, accepts the message. Upon detecting the message is of the sync-verify type by each IOP …
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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 September 18, 1991 and granted May 26, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 2013.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.