Filter cartridge
CA 2132702 C · Owner: Wnenchak, Raymond · Inventors: Wnenchak, Raymond; Tronto, Gregory Scott
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pleated filter cartridge for removing particles or dust from a gas stream is described. The cartridge is made of a perforated support tube, a pleated filter medium around said tube and end caps into , which the ends of the filter medium and the tube, are sealed, wherein the pleated filter medium has less than seven pleats per inch and comprises a laminate of a nonwoven or felt backing and an expanded porous polytetrafluoroethylene.
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 26, 1992 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 26, 2014.
- 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.