A bulkhead door arrangement
CA 2112911 C · Owner: Sandwall, Nils · Inventors: Sandwall, Nils
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a bulkhead door arrangement for sealingly closing an opening (38) which is located between two mutually adjacent spaces and through which a conveyor belt (4) extends, The arrangement includes a vertically moveable door part (1) provided with a sealing strip (5) on the side thereof facing towards the conveyor belt. According to the invention, when the door arrangement is in its closed position the door part (1) , presses the conveyor belt (4) into abutment with a sealing strip (8) provided in the bottom of the opening with a predetermined abutment pressure, and separate sealing devices (15 22) abut the side-edge surfaces (17, 24) of the conveyor belt in …
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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 July 17, 1992 and granted October 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 2014.
- 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.