Method of filtration and filter to carry it out
CA 2006239 C · Owner: Andreae, Robert · Inventors: Andreae, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of filtration of a gaseous flow in which said flow is passed through at least one chamber the inlet and outlet openings of which are displaced to cause a turbulent flow projecting the particles of greater size against the walls of the chamber. At least one part of the gaseous flow is evacuated out of said chamber through a porous downstream wall which catches the finest particles. The filter has two walls (1,5) of different length connected the one to the other along every second fold (2,6). The downstream wall (5) is formed of a porous unwoven bed of fibres. The two walls (1,5) are provided with displaced openings.(4,8)
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 December 20, 1989 and granted March 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2011.
- 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.