Apparatus and method for automatically achieving and maintaining congruent control in an industrial boiler
CA 2415685 C · Owner: Betzdearborn Inc. · Inventors: Boyette, Scott M.; Burgmayer, Paul R.; Thungstrom, Eric A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A control system for automatically achieving and maintaining a desired sodium/phosphate ratio and phosphate concentration of the boiler water in an industrial. boiler for minimizing corrosion. The system uses an adaptive controller that models the boiler which enables the system to predict boiler pH and phosphate concentrations at any future time given the feed rates feed concentrations of high and low sodium/phosphate stocks blowdown rate, mass of the boiler water initial boiler phosphate concentration and initial pH. Once these future concentrations are determined the controller then determines which feed rates will return the current boiler water state to and then maintain the boiler …
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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 August 24, 1995 and granted December 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 24, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2017.
- 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.