Defibrator having improved defibration
CA 2175238 C · Owner: Kroyer, Ingelise Kobs · Inventors: Kroyer, Karl Kristian Kobs (Deceased)
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A defibrator (1) is disclosed which, makes it possible to distribute defibrated cellulosic fibers directly onto a forming wire (5). The defibrator (1) comprises ribs (33) extending inside a cylindrical housing (24). The ribs have outer curved surfaces which direct fibers into an area (35) in which beater plates (25) are acting. A grate (37) in front of an outlet (30) from the circular housing (24) is arranged at the periphery (35) for the rotation of the beater plates (25). The grate has an interspace between grate bars only allowing fibers to pass through. Accordingly, agglomerates are returned into the working area of the beater plates (25). As the beater plates (25) act several times on …
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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 October 28, 1994 and granted February 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 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.