Method and device for preventing or releasing a blocking caused by logs fed to a chipper through a feeding chute
CA 2283455 C · Owner: Andritz Patentverwaltungs-Gesellschaft Mbh · Inventors: Perhson, Ulf; Olofsson, Anders
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to procedures and arrangements for preventing or releasing a blockage occurring in a flow of tree trunks (3) supplied to a wood chipper (2) via a feed hopper (1), and for securing an uninterrupted flow of timber to the chipper. The inventive procedure is characterized by providing one or several lifting means (4), which are insertable to project through openings (5) defined in the hopper (1) said lifting means (4) being inserted momentarily to raise tree trunks wedged in the hopper and/or controlled momentarily for limiting the amount of tree trunks supplied to the chipper (2).
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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 14, 1998 and granted June 25, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 14, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 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
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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.