Continuously self-cleaning drum filter
CA 2257332 A1 · Owner: Smith, James Andrew · Inventors: Lawrence, Michael E.S.; Smith, James Andrew
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A continuously self-cleaning filter consists of a rotating drum filter an, oscillating high-pressure air nozzle to remove cake and particles from the filter mesh; the means to drive the drum filter and the oscillating nozzle; and, a chute to catch the material dislodged from the filter mesh and to direct it to, a receiving tank. To accomplish this water, containing dirt particles, droplets of free oil or metal particles, oil or other contaminants encapsulated in bentonite clay, is directed onto the inner surface of the drum filter mesh at the , lowest, point of its rotation where substantially all of the water passes through the filter mesh, while the particles or cake are trapped in the …
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 December 21, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2020.
- 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.