Air filtration system
CA 2334480 A1 · Owner: Reinhard, William A. · Inventors: Bailey, J. Rushton; Reinhard, William A.; Frazier, Stephen E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air filtration system is disclosed which incorporates a dual-layer electret filter having bypass openings in each layer for allowing a small portion of the air flowing through the filter to pass through the filter layer unfiltered. The system allows for the use of a smaller fan motor and a higher throughput of air while maintaining a laminar air flow and low back pressure resulting in an efficient and substantially quieter air filtration unit.
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 February 7, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2023.
- 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.