Filter of processing volume ratio adapted screw press type
CA 2293725 A1 · Owner: Terra Separator Co. Ltd. · Inventors: Katabe, Toyokazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A screw press type filter which comprises an alternately superposed arrangement of annular fixed plates (10) and annular movable plates (11) a , filter cylinder (2) defining a fixed cylindrical space (12) by a row of openings of the fixed plates with both end portions of a screw (5) passed through this cylindrical space extending to inlet and outlet chambers (1 3), and mechanisms (15, 16) for turning the movable plates in accordance with the rotation of the screw also provided, wherein the volumes of the spaces between adjacent ridges of the screws in the filter cylinder are reduced gradually from an inlet toward an outlet so that such a volume decrease corresponds to a gradual …
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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 April 9, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 9, 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.