Air filtration device
CA 2533022 C · Owner: Hallam, David Richard · Inventors: Hallam, David Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides an air filtration cartridge (1) suitable for use in the treatment of air in a forced airflow air supply system. The cartridge (1) comprises an inner casing (2) having an upstream stage (3) defining a chamber (4) having an inlet (5) for receiving a forced airflow (6). The chamber (4) has an outlet (7) which leads into a downstream stage (8) comprising a filter holder and mounting a high airflow electrostatic filter. Inside the chamber (4) is a low power coronal discharge ozone generator device (10).
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 July 19, 2004 and granted November 20, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 19, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 19, 2026.
- 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.