Device for metered extraction of bulk solids
CA 2188062 C · Owner: Bruggendick, Hermann · Inventors: Bruggendick, Hermann; Bialowons, Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An extraction hopper (1) with a feed aperture (3) is filled with a bulk substance (2). Beneath the feed aperture (3) there is a rotary feed-through (4) the peripheral wall (5) of, which delimits a feed-through chamber (6). The cylindrical peripheral wall (5) has an inlet/outlet aperture (7) matched to the cross-section of the feed aperture (3). In its upwardly directed position it communicates with the feed aperture (3). The bulk substance falls into the feed-through chamber (6) and immediately fills it. To empty the chamber the rotary feed-, through is rotated through 180° whereupon the feed aperture, (3) of the extraction hopper (1) is closed off from the peripheral wall. It is thus …
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 April 13, 1995 and granted May 29, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 13, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 13, 2017.
- 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.