A method and apparatus for controlling the feed of water treatment chemicals using a voltammetric sensor
CA 2180365 C · Owner: Buckman Laboratories International, Inc. · Inventors: Mcneel, Thomas E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for controlling the chemical treatment of a solution comprises the steps of feeding a treatment chemical into the solution applying an external voltage across a reference electrode and a working electrode of a voltammmetric sensor while the electrodes are immersed in the solution, measuring a current that flows through the working electrode converting the measured current into a feedback signal indicative of the concentration of treatement chemical in the solution and using the feedback signal to control the rate of feeding the treatment chemical.
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 January 12, 1995 and granted March 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 12, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 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.