Sifting device
CA 2127499 C · Owner: Gumpesberger, Ralph Peter · Inventors: Gumpesberger, Ralph Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for sifting a siftable material comprises at least three nestable trays. The trays are stacked to form a vertically stacked array. Each tray has a base having a plurality of ribs defining a plurality of openings sized to permit the material to pass through while preventing passage of, large objects. The openings of each tray are arranged in a pre-set pattern so that pairs of trays may be nested together with the openings of one tray blocked by the ribs of the other. The trays may be identical with the openings arranged asymmetrically in the base of each tray so that the, necessary interference or blocking is achieved by rotating each tray relative to the adjacent tray. …
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 6, 1994 and granted June 16, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 6, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 6, 2016.
- 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.