Ionizing and polarizing electronic air filter
CA 2270976 C · Owner: Joannou, Constantinos J. · Inventors: Joannou, Constantinos J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high efficiency electronic air filter is based on a fibrous pad of dielectric fibres which is sandwiched between an electrically charged ionizing grid and a grounded screen. The ionizing grid charges the dust particles passing through the filter and at the same time the grid and screen polarize the fibrous pad. In this way, the charged particles are attracted and collected on the polarized fibrous pad with improved efficiency.
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 November 8, 1996 and granted April 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 8, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2018.
- 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.