Ctmp-process
CA 2073763 C · Owner: Danielsson, Ove · Inventors: Danielsson, Ove; Falk, Bo; Hoglund, Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An absorbent, chemithermomechanical pulp produced from lignocellulosic material with a wood yield above 88% a low, resin content < 0.15 %, a long fibre content above 70 % a short fibre content below 10 % and a shive content below 3%. A method for producing the pulp. The method comprises the steps of impregnating preheating, defibring, and washing the material. The impregnation and preheating of the chips are effected in one and the same vessel over a combined time period of at most 2 minutes, particularly at most 1 minute preferably at most 0,5 minutes; using a warm impregnating liquid having a temperature of at least 100°C, suitable at least 130°C and preferably having essentially the same …
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, 1991 and granted March 16, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 11, 2013.
- 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.