Method for producing pulp for papermaking using microwave heating of treated chips and defibration
CA 2008526 C · Owner: Valade, Jacques L. · Inventors: Law, Kwei-Nam; Valade, Jacques L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing pulp, primarily wood pulp from lignocellulosic, material such as wood chips using microwave irradiation of chemically treated chips prior to mechanical defibration. The novel aspect of the microwave irradiation prior to refining is that it results in reduced cooking time and energy.
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 January 25, 1990 and granted April 9, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 25, 2012.
- 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.