Filter system for smoke or polluted air
CA 2136221 A1 · Owner: Kit, Franklin T. · Inventors: Mai, Kong-Ming; Kit, Franklin T.; Mai, Sung-Chuan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter system for smoke or polluted air comprises a smoke or pulluted air filter device (2), a bag filter device (81) and a water treatment device (3). A duct (2) and a plurality of power sprayers (601, 602, 603) are provided in the smoke or polluted air filter device (2) to remove harmful substances in the smoke or the polluted air. A plurality of filtering air bags (8) are provided in the bag filter device to clean the waste liquid coming from the smoke or polluted air filter device. A plurality of treating troughs (33) are provided in the water treatment device to purify the liquid flowing down from the filter bag device. A coarse ash collecting device (30) is provided additionally in …
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 17, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2015.
- 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.