Filtering device
CA 2201239 C · Owner: Takarabe, Takasi · Inventors: Nakatani, Hironobu; Takarabe, Takasi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filtering device provided a horizontal drum in which a filter layer made of granular filter material and a space portion are formed in a vertical direction within its interior; a crude water introducing/dirty water discharging first water flow pipe which passes through an axial portion of the horizontal drum from the outside of the horizontal drum and whose a crude water introducing/dirty water discharging first water flow portion is located in the space portion; and a filtered water introducing/washing water discharging second water flow pipe which passes through an axial portion of the horizontal drum from the outside of the horizontal drum and whose a filtered water introducing/washing …
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 March 27, 1997 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2019.
- 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.