Filter cartridge
CA 2036639 A1 · Owner: Johansson, Ronald C. · Inventors: Johansson, Ronald C.; Elstran, Gerald V.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A replaceable filter cartridge that has a peripheral frame and a sheetlike filter medium can be made in a simple, inexpensive, insert-molding operation. The mold has a cavity for producing a peripheral frame and shutoffs permitting each end of the strip to extend across the cavity. Resin injected into the cavity flows through and disrupts the continuity of the strip where it extends across the cavity, preferably fusing fibers of the filter medium into the resin that forms the frame. When the filter medium is pleated, its longitudinal edges are sealed to the frame in a serpentine path.
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 February 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 2013.
- 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.