Method of purifying lacustrine water and filthy water purification boat
CA 2058623 C · Owner: Kanai, Masakuni · Inventors: Kanai, Masakuni
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method enabling thorough purification of lacustrine water with simple operation in an energy-saving manner within a short period of time and being free from the possibility of secondary public nuisance, and further a filthy water purification boat for implementing said method. According to this invention while operating, filthy water purification boat having an electrolyzing device for calcium fluoride, DC current power source and coagulant pouring, device mounted thereon on lakes or marshes the electrolyzing, device is operated and coagulant is fed into a pipe having a coagulant pouring nozzle. Lacustrine water while passed through, electrodes, is fed with fluorine ion and coagulant and …
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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 April 9, 1991 and granted May 25, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 9, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 2013.
- 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.