Air cleaner
CA 2030731 A1 · Owner: Andreev, Vladimir V. · Inventors: Glushkov, Jury I.; Andreev, Vladimir V.; Ulitsky, Alexandr D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air cleaner which comprises a housing with an airsupply pipe forming an annular clearance. A main filtering member is placed in the clearance and in close vicinity to the opening of the air-supply pipe and additional filtering member is located having a recess coaxial to the pipe. The recess size on the surface of the additional filtering member is greater than the pipe diameter.
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 23, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2012.
- 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.