Filter cartridge
CA 2017138 C · Owner: Carl Freudenberg · Inventors: Lippold, Hans-Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Filter cartridge, in particular with a block-like shape comprising a plurality of fold walls created by folding a permeable filter medium in a zig-zag fashion and which is provided with offsets formed by scoring so that a medium to be filtered passes through from one edge area of the zig-zag folding in the direction of the edge area of the folding on the opposite side, whereby the offsets of adjacent fold walls which face one another contact each other as spacers and that said filter medium is at least hardenable in the region of said offsets under the influence of heat, wherein the permeable filter medium comprises fibres of thermoplastic material and that the configuration of the fibres …
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 19, 1990 and granted May 4, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 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.