Apparatus for clarification of industrial sewage
CA 2043244 C · Owner: Permyakov, Georgy P. · Inventors: Zlobin, Mikhail N.; Permyakov, Georgy P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for clarification of, industrial sewage comprises a vertical cylindrical chamber for circulation of industrial sewage with a conical bottom secured to which are a branch pipe for feeding the polluted industrial sewage with flocculants, and a branch pipe for discharging the slurry. Secured outside of the cylindrical chamber at its upper edge is a circular trough for draining the purified sewage while inside the chamber are arranged partitions for settling of solid particles and at least one separating partition in the form of a body of revolution with holes for distributing polluted sewage over the volume of the chamber said, partition being installed axially in the central part …
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 May 24, 1991 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 24, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 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.