Dust filter
CA 2002785 A1 · Owner: K.D.S. Industries Inc. · Inventors: Kasakewich, Darrell S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
DUST FILTER", Abstract of the Disclosure A filter for the register or diffuser on a HVAC system is provided. The filter comprises a thermoplastic frame a, filter element and a thermoplastic filter element support grid. The filter element comprises a blend of lamb's wool and a synthetic fibre. The filter element material and thermoplastic grid are adapted to, in combination, generate a permanent electrostatic charge thereby attracting the collection of dust thereon.
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 November 10, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 10, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2011.
- 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.