Filter medium washing method and filter
CA 2423865 A1 · Owner: Takarabe, Takashi · Inventors: Takarabe, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A multi-layer filter, wherein a filter medium inside a rotatable or swingable horizontal drum (3) is formed in a multi-layer shape with a single or a combined grading, specific gravity, and characteristic of filter medium desirably according to the purpose of treatment and washed with raw water while rubbing the filter medium by rotating or swinging the drum (3) so that contaminant can be removed to surely recover the filter medium at each layer a raw water inflow tube (5) and a filtrated water outflow tube (7) are formed double, a sandproof means and a filter medium agitating means are installed on both or either of the tubes, and a cleaning means and an adhesion prevention means …
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 September 27, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 27, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 27, 2023.
- 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.