Air filter assembly
CA 2273518 C · Owner: Hoeffken, Russell · Inventors: Hoeffken, Russell
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air filter has a generally rectangular frame having surfaces defining generally a, plane, and a pair of parallel side rails and a pair of parallel end rails along outer edges of the, plane-defining surfaces the rails flaring outboardly at an obtuse angle from the plane when, the frame is unconfined one of the rails at each corner of the rectangular frame being, provided with tabs, and the other contiguous of the rails at the corner having an open end into, which the tab extends. The tabs have an angled outer surface and are of a length compared, with the height of the open end to be held against movement clear of the open end in every, position of the rails when the frame is …
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 June 1, 1999 and granted January 22, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 1, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 1, 2021.
- 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.