Method for coating a roll and a coated roll for a paper machine
CA 2115474 C · Owner: Lehtonen, Pentti Sakari · Inventors: Lehtonen, Pentti Sakari
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A coated roll and a method for coating a roll used in a paper machine. Desired surface property values of the roll are fed into a central unit of the coating system and the roll is coated while following a function f1(x),f3(x) created in the central unit over the distance of the length of the roll. A surface hardness and/or surface profile corresponding to the formed function f1(x),f2(x) is derived which does not have any steps or other points of discontinuity. The roll is coated with a polymer, preferably polyurethane.
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 February 11, 1994 and granted December 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 11, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 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.