Filter medium
CA 2487164 A1 · Owner: Heinz, Beate · Inventors: Schnieders, Immo; Heinz, Beate
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a filter medium (10) that is adapted to effectively retain not only microparticles but also particles in the nanometer range. The inventive medium consists of at least one layer of material (20) and at least one fine-structured layer (30), whereby for the first layer preferably crosslinked cellulose fibers and microglass fibers but also polymer-based fibers are used. The diameter of the fibers of the layer of material (20) are in the micrometer range and the pores of said layer have mainly diameters in the squaremicrometer range. The very lightweight fiber structure with weights per unit of under 1 g/m2 has intermediate spaces down to the nanometer range and …
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 28, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 28, 2025.
- 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.