Refiner segment
CA 1297329 C · Owner: Sunds Defibrator Aktiebolag · Inventors: Virving, Nils
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A refiner segment (1) for disc refiners is formed with a pattern of bars (2,4) and grooves (3,5) and flow, restrictions (6) are located in the grooves (5). Through apertures (8) in the bars (4) the grooves (5) communicate with each other so that the grooves have free communication outward and inward via the apertures (8).
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
- Granted March 17, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 17, 2009.
- 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.