Improved method for sealing the edge of a filter medium to a filter assembly and the filter assembly produced thereby
CA 2182209 C · Owner: Racal Filter Technologies, Ltd · Inventors: Marble Keith S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved filter, assemblies are provided having a pleated filter, medium (23) attached to a support frame (20) utilizing, an improved manufacturing method employing a welding, process to seal the pleated edges of the filter medium, to an inwardly protruding sealing means (22) provided, on the frame (20) around the inside perimeter thereof, forming a final filter assembly exhibiting an, essentially leak-proof edge seal.
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 9, 1995 and granted August 12, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 9, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 9, 2017.
- 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.