Porous material, air filter medium, air filter unit and support material for air filter medium
CA 2355246 A1 · Owner: Daikin Industries, Ltd. · Inventors: Uraoka, Nobuki; Inoue, Osamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air filter filter medium having a polytetrafluoroethylene porous membrane and an air-permeable support material laminated on at least one surface of the porous membrane, wherein the porous membrane and the support material are bonded together via a fibrous hot-melt adhesive concatenated by independent fibers and/or knots, thereby keeping a high trapping efficiency of an air filter filter medium and a pressure loss as low as that encountered with a fusion bonded one.
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 December 7, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 7, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 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.