Filter device
CA 2493964 A1 · Owner: Nihon Genryo Co. Ltd. · Inventors: Saito, Yasuhiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A filter device where filter sand is less likely to clog and unevenness of the sand is less likely to occur. The device enables washing and rinsing of filter material in a short time. In a filter vessel (2) a screw conveyor (32) is , provided in a wash vessel (38) hanged from the upper side. Space (52) is formed between a filter bed (4) and a metallic net (50) that are vertically separated. A filter material (14) is provided above the metal net (50) and , filter material (54) having a larger grain size than the filter material (14) is provided in the space (52). Strainers (12) are provided in the filter bed (4). A wash water jet pipe (58) is installed on the outer wall of the space …
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 July 29, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 29, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 29, 2025.
- 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.