Air filter
CA 2379499 A1 · Owner: Osaka, Katsumi · Inventors: Suzuki, Katsumi; Oba, Toshinori; Suzuki, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air filter capable of efficiently arresting carbon particles from dust in the air while maintaining a long service life and suppressing a cost comprising a first filter layer (11) soaked with oil and a second filter layer (12) disposed on the downstream side of the first filter layer (11) and forming an oil-repellent layer having an oil repellent property wherein the , filter material of the first filter layer (11) is formed denser than that of the second filter layer (12).
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 21, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 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.